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Different levels of estradiol are correlated with sexual dysfunction in adult men


Ejaculatory dysfunction, including premature ejaculation (PE) and delayed ejaculation (DE), as well as erectile dysfunction (ED), constitute the majority of male sexual dysfunction. Despite a fair amount of data on the role of hormones and erection and ejaculation, it is inconclusive due to controversy in the current literature. To explore the correlation of male sexual dysfunction with hormonal profile, 1,076 men between the ages of 19–60 years (mean: 32.12 years) were included in this retrospective case–control study; 507 were categorized as ED, PE and DE groups. Five hundred and sixty-nine men without sexual dysfunction were enrolled in the control group. The background characteristics and clinical features of the four groups were collected and analyzed. The estradiol value was significantly elevated in the ED group than the control group (109.44 ± 47.14 pmol/L vs. 91.88 ± 27.68 pmol/L; P < 0.001). Conversely, the DE group had significantly lower level of estradiol than control did (70.76 ± 27.20 pmol/L vs. 91.88 ± 27.68 pmol/L; P < 0.001). The PE group had similar level of estradiol (91.73 ± 31.57 pmol/L vs. 91.88 ± 27.68 pmol/L; P = 0.960) but significantly higher level of testosterone (17.23 ± 5.72 nmol/L vs. 15.31 ± 4.31 nmol/L; P < 0.001) compared with the control group. In conclusion, elevated serum testosterone concentration was an independent risk factor for PE. Besides, there was a progressively increasing graded-distribution of estradiol values from DE to PE and ED groups.


Sexual dysfunction is a common clinical entity worldwide and has a deleterious role in quality of life for the couple1. In men, erectile dysfunction (ED) and ejaculatory dysfunction are the most reported sexual dysfunction. According to the timing of ejaculation, ejaculatory dysfunction can be classified into premature ejaculation (PE) and delayed ejaculation (DE)2. ED is involved in pathophysiological alterations via neurogenic, psychoneurologic, vasculogenic, endocrine and iatrogenic pathways. In contrast, the etiology of ejaculatory dysfunction is under-reported and the understanding of hormonal control in ejaculatory dysfunction is still in its infancy.

Hormones can regulate many aspects of male reproduction. Endocrine disorders, including hypogonadism, thyroid diseases and hyperprolactinaemia, has been implicated in the pathogenesis of ED3. Testosterone is the major hormonal regulator of penile development and physiology, and affects both the central and peripheral levels of the ejaculatory process1. Aromatase is responsible for the conversion of testosterone to estrogen and localized abundantly in the male reproductive system. Levels of estradiol have been demonstrated to be correlated with the incidence and severity of ED4, which could be explained by two hypotheses. One hypothesis is that the imbalance between estradiol and testosterone decreases the relaxation of cavernosal smooth muscle via an NO-mediated pathway5. The other hypothesis is that estrogen could antagonize the effect of testosterone through the sympathetic and parasympathetic nervous system, which in turn influence erectile function6. Apart from the effect on erectile function, estrogen also influences ejaculatory function. In mice, the expression pattern of estrogen receptor (ER) is unique throughout male reproductive tract other than the epididymis. In the epididymis, both ERα and ERβ are expressed7. In doing so, epididymal contractility, critical for the first step of emission phase during ejaculation, is regulated by estradiol8. ERα or aromatase knockout male mice displayed decreased intromissions and ejaculations compared with wild-type controls9,10. In contrast to these findings, several case reports indicated that sexual behavior did not change in men lacking ERα or aromatase11,12. Therefore, the influence of ERα or aromatase in males remains controversial.

Collectively, despite a fair amount of data on the role of hormones and erection and ejaculation, it is inconclusive due to controversy in the current literature. Besides, no prior study has investigated the relationship between estradiol and ejaculatory dysfunction in men to date. We hypothesized that testosterone and estradiol might be involved in the regulation of erection and ejaculation in men. To investigate the correlation of hormonal profile with ED, PE, and DE, we conducted a retrospective case–control study with 1,089 men at our institution.

Materials and methods

Study population

Between May 2016 and April 2018, adult men with ED, PE or DE who firstly attended andrology clinic of the hospital were enrolled in the current study. Exclusion criteria were: untreated endocrine disorders, psychiatric disorder, anatomical penile abnormality, alcohol or drug abuse in the previous two years, and taking drugs (pseudoephedrine, antidopaminergics, testosterone preparations, serotonin reuptake inhibitors, and antihypo/hyperthyroidism drugs) which might influence intra-vaginal ejaculation latency time (IELT) or hormonal values. Participants were dissuaded from drinking alcohol before sexual intercourse. The coincidence of ED and PE is common in clinical practice, and patients with ED and PE were not taken into the present study. During the same period, subjects from the control group were randomly selected among participants without sexual dysfunction who carried out a health examination before undergoing in-vitro fertilization (IVF). Clinical features of the participants, including background information and hormonal profile, were collected. The study protocol was approved by the ethical committee at Center for Reproductive Medicine, Shandong University. Informed consent was obtained from all participants for this study. Besides, all methods were carried out in accordance with relevant guidelines and regulations.

Assessment of ED, PE and DE

All participants possessed a stable, monogamous, heterosexual relationship with the partner, and the disease lasted for at least six months. The female partners of the subjects were proposed to apply a calibrated stopwatch to measure IELT. ED is the persistent inability to obtain or maintain an adequate erection to enable satisfactory sexual performance. A patient was diagnosed with ED when IIEF-5 score was smaller than 2213. During the screening period, the diagnosis of PE was confirmed when IELT results of sexual intercourse suggested a baseline IELT prior to or within one minute of vaginal penetration at least three times14. Furthermore, as the median IELT was 5.4 min in healthy men2, the diagnosis of DE was confirmed when the baseline IELT was longer than 25 min (mean plus two standard deviations) and the patient ceased sexual activity due to irritation, exhaustion, partner request or erection loss15.

Measurement of hormonal parameters

For the determination of the hormonal profile, participants with overnight fast were arranged in sitting posture for 30 min before sampling, and then blood samples were drawn from the antecubital veins between 8 and 10 am. Serum samples were analyzed for follicle-stimulating hormone (FSH), luteinizing hormone (LH), prolactin (PRL), total testosterone (T), estradiol (E2), and thyroid-stimulating hormone (TSH). When abnormal values appeared, a second sample of the blood was obtained for the re-assessment. The hormonal levels were investigated using the Cobas 6,000 analyzer series (Roche Diagnostics GmbH, Mannheim, Germany) in the laboratory department of the hospital. Among these hormones detected, serum estradiol levels were measured using Elecsys estradiol III kit (Roche Diagnostics Ltd., Shanghai, China). The lower and upper detection limits for estradiol were 28.0 and 156.0 pmol/L, respectively. In addition, the intra-assay coefficient of variation was below 10%, and inter-assay coefficient of variation was below 15%.

Statistical analysis

We ran the data analysis using SPSS (version 22.0, Chicago, IL, USA) and two-sided P values < 0.05 were considered statistically significant. Data were assessed for normality using the Kolmogorov–Smirnov test. The population of the current study was categorized as four groups, namely, ED, PE, DE and control groups. The results were reported as mean ± standard deviation (SD) for continuous variables and number with percentage for categorical variables. One-way ANOVA followed by Student–Newman–Keuls post-hoc test was used to assess the continuous variables. Kruskal–Wallis method was applied for the analysis of skewed variables. The categorical variables were analyzed using Pearson χ2 test. For the comparison of differences between two groups, means of normally distributed parameters were analyzed using Student’s t test. The contribution of different variables to ED, PE and DE groups was determined using multivariable logistic regression. The odds ratio (OR) was explained as the measurement of correlation.


Patient characteristics and hormonal profile

Among 507 men with sexual dysfunction, 277 (53.1%) complained of ED, whereas 124 (23.8%) and 106 (20.3%) declared PE and DE, respectively. Besides, 569 men without sexual dysfunction were recruited in the control group. Table 1 indicates the baseline information of the participants. Figure 1 illustrates the means and 95% confidence interval (CI) of E2, T and E2-T ratio among control, ED, PE and DE groups, respectively. The comparison of hormonal profile among groups is summarized in Table 2. Testosterone values in the PE group were significantly higher than those in the control group (17.23 ± 5.72 nmol/L vs. 15.31 ± 4.31 nmol/L; P < 0.001). Furthermore, estradiol levels were significantly higher for patients with ED (109.44 ± 47.14 pmol/L; P < 0.001), but significantly lower for patients with DE (70.76 ± 27.20 pmol/L; P < 0.001) compared with those in the control group (91.88 ± 27.68 pmol/L). The ED group had a significantly higher E2-T ratio than control (7.49 ± 3.96 × 10−3 vs. 6.37 ± 2.41 × 10−3; P < 0.001) did. Conversely, the E2-T ratio was significantly decreased for patients with PE (5.77 ± 2.46 × 10−3; P = 0.021) and DE (5.21 ± 2.42 × 10−3; P < 0.001) than for patients in the control group (6.37 ± 2.41 × 10−3).

Table 1 Background characteristics of the participants among groups.
Figure 1

Error bar charts of E2, T and E2-T ratio among control, ED, PE and DE groups. (A) The means and 95% CI of E2 among four groups; (B) The means and 95% CI of T among four groups; (C) The means and 95% CI of E2-T ratio among four groups. E2-T ratio: estradiol to testosterone ratio. CI confidence intervals.

Table 2 Hormonal profile of the participants among groups.

Independent risk factors for ED, PE and DE

Multivariable logistic regression analyses were conducted to explore the ORs for ED, PE or DE. In order to determine independent risk factors, age, BMI, smoking, hypertension, diabetes, testosterone, estradiol, TSH, and prolactin were considered as confounders in the regression models. Figure 2 shows the OR of ED, PE or DE group for controls as the reference. Estradiol was considered as an independent risk factor for ED and DE. Specifically, the OR of ED group versus controls was 1.068 (95% CI 1.018–1.121, P < 0.001), and the OR of DE group versus controls was 0.919 (95% CI 0.870–0.968, P < 0.001). Furthermore, testosterone was an independent risk factor for PE, and the OR of PE group versus controls was 1.154 (95% CI 1.021–1.305, P < 0.001).

Figure 2

Risk for ED, PE and DE as estimated by different variables. (A) The OR of ED for normal controls as references; (B) The OR of PE for controls as references; (C) The OR of DE for controls as references. OR odds ratio; CI confidence interval.

Distinguishing ED, PE and DE using estradiol levels

As the mean level of estradiol was significantly different among groups, the diagnostic effect of the estradiol level for ED, PE, or DE was determined. The receiver operating characteristic (ROC) curve was used to explore area under the ROC curve (AUC) in every group using the estradiol values (Fig. 3). The AUC of ED group is 0.601 and the estradiol level of ED patients is significantly higher than that of men in the control group (Fig. 3A, SE: 0.023, 95% CI: 0.556–0.645, P < 0.001). However, estradiol levels were unlikely to distinguish PE patients from normal cases (Fig. 3B, P = 0.387). In addition, the AUC of the DE group is 0.716 (Fig. 3C, SE: 0.028, 95% CI: 0.661–0.771, P < 0.001). Figure 3D indicates the significantly distinguishing ability of estradiol values between PE and DE groups (AUC = 0.693, SE: 0.037, 95% CI: 0.620–0.766, P < 0.001).

Figure 3

ROC curves of E2 with values correlated with AUC. (A) The ROC curve of E2 to diagnose ED; (B) The ROC curve of E2 for to diagnose PE; (C) The ROC curve of E2 to diagnose DE; (D) The ROC curve of E2 to distinguish between PE and DE.

The best value to distinguish PE from DE was explored using ROC curve and AUC that was 14.86 nmol/L of testosterone (AUC: 0.671, SE: 0.036, 95% CI: 0.600–0.742, P < 0.001). Subjects with testosterone > 14.86 nmol/L were more likely to report PE compared with those with testosterone < 14.86 nmol/L (Sensitivity = 0.619, Specificity = 0.726). PE and DE subjects with testosterone < 14.86 nmol/L were further explored using ROC curve followed by AUC of estradiol, and the best value was 79.41 pmol/L (Sensitivity = 0.741, Specificity = 0.613; AUC: 0.703, SE: 0.061, 95% CI: 0.584–0.823, P < 0.001). However, levels of estradiol were unlikely to distinguish DE from PE in these patients with testosterone > 14.86 nmol/L (P = 0.058). Therefore, we arranged all 528 cases with testosterone < 14.86 nmol/L into eight groups according to the crucial cutoff value of estradiol, and Fig. 4 illustrates the proportion of each group. For cases with testosterone < 14.86 nmol/L, it was likely for DE subjects to possess lower absolute value of estradiol, whereas the other subjects tended to have higher estradiol values.

Figure 4

The number of the participants in the four groups. All the participants with T < 14.86 nmol/L were then categorized as two groups based on E2 of 79.41 pmol/L.


Overall, our data indicated that significantly higher testosterone values were found in the PE group than in the control group. Levels of estradiol were significantly higher for ED patients, but significantly lower for DE patients when compared with control. The OR of DE was 0.919 for normal controls as the reference. Moreover, the OR of ED was 1.068 for normal controls as references. The best value to distinguish PE from DE was explored using ROC curve and AUC that was 14.86 nmol/L of testosterone.

The pathophysiological role of testosterone in ED has been extensively investigated. However, evidences on the correlation of testosterone levels with ED still remains controversial. Some studies documented that testosterone levels were not associated with ED16,17, whereas others reported associations between definitely subnormal levels of testosterone and ED18. Our data demonstrated that no statistically significant differences were observed between ED and control groups. Furthermore, as hypothesized, ED was affected by high estradiol levels or the imbalance between estradiol and testosterone19. Men with higher estradiol levels had reduced spontaneous erections, decreased nocturnal penile tumescence and greater levels of psychological distresss20. In animal models by use of rabbits, increased estrogen levels were associated with ED21, and the structure of corpus cavernosum was damaged by administration of exogenous estrogen19. The current study, with 88.39% of participants being younger than 40 years old, indicated that elevated estradiol levels were associated with ED in young men. Simultaneously, one interesting finding is that BMIs in the groups did not show a significant difference, but the estradiol level was significantly higher in the ED group. As the majority of aromotase is localized to lipid cells22, it is plausible to assume that men with higher estradiol levels are those who are most obese and obesity has clearly been associated with ED23,24. To the best of our knowledge, body weight is made up of the sum of fat and lean mass. In men with reduced muscle mass, excess body fat can occur within the normal BMI range. In addition, BMI does not take into account the accumulation of visceral fat that characterizes the most morbigenous form of obesity: central obesity. Waist circumference appears to be more suitable to explain obesity-related health risks than BMI25. Also, previous studies demonstrated that waist circumference was superior to BMI in predicting ED23,24. Therefore, the reasonable explanation is that the percent of men with central obesity in the ED group might have been higher compared with that in the other groups. Central obesity may not lead to an elevated BMI but can give rise to a higher estradiol level. Similar to our results, recent study reported that elevated estradiol level was significantly associated with ED independent of BMI26.

The effect of testosterone on ejaculatory reflex could be explained by central, spinal and peripheral mechanisms1. In animal models, elevated testosterone levels decreased serotonin and its metabolite, contributing to PE18. Our results reported that PE patients had significantly higher levels of testosterone compared with control. Similar results were reported by other studies27,28. Yet, Patrick et al. found no association between PE and testosterone levels29. One possible explanation was that saliva samples, instead of blood samples, were applied to measure testosterone levels in Patrick’s study29. Although some previous studies reported that low testosterone values were correlated with DE27,28, there was no relationship between testosterone values and DE in the present study. This discrepancy could be illustrated by various populations and different eligibility criteria. One advantage of the current study was that the mean age of DE patients and normal controls were 32.19 and 32.33 years, respectively, eliminating the potential influence of aging on testosterone levels. In line with these observations, a recent prospective study reported that normal testosterone levels were found in most of the patients with DE30. It has been proposed that thyroid function and prolactin can modulate and interact with the male genital tract even within the normal range31,32. Besides, low level of prolactin is associated with a lessened ability to control ejaculation reflex32. However, our data demonstrated that there was no significant difference in levels of TSH or prolactin among the groups. Population-related differences might justify this discrepancy, and the association between TSH or prolactin and ejaculatory disorders merits further investigation.

Although high estradiol milieu may adversely affect male sexual function, a moderate estradiol value is beneficial. Men with decreased estradiol levels reported low libido and sexual activity, which could be improved by estrogen administration33. Ramasamy et al. demonstrated that in men with decreased libido and testosterone levels below 300 ng/dl, libido was significantly improved when the estradiol level was over 5 ng/dl34. ERα, ERβ and aromatase were widely expressed in male genital tract8. Particularly, ERα and ERβ were abundantly localized in epididymal cauda, suggesting the role of estrogen in regulating epididymal function1. Specifically, in the emission phase during ejaculation, estrogen influences epididymal contractility, thus affecting the latency time8. Estradiol could revert hypogonadism-induced downregulation of RhoA/ROCK pathway and restore epididymal contractility20. In both rats and humans, ERα, ERβ and aromatase were profusely expressed in male brain, and masculinization of male brain is modulated by locally produced estrogen20. Estrogen can influence mood, mental state, cognition, and emotion through an interaction with serotonin receptors20. In men with aromatase deficiency, estrogen treatment enhances libido, sexual activity, and erotic fantasies21. Animal experiment revealed that aromatase inhibitors significantly reduce ejaculatory activity and sexual motivation, which could be improved by estradiol administration20. Decreased intromissions and no ejaculation were observed in ERα or aromatase knockout mice9,10. However, a man lacking ERα was reported to have no change in sexual behavior12. The current study indicated that estradiol values were significantly decreased for subjects in the DE group than for subjects in the control group. Due to anxiety, fear or attention deficit disorder, DE is characterized by disorders of arousal and sexual cues. Decreased estradiol values might lead to mood disorders before or during sexual intercourse. Also, the contractility of epididymis might be decreased in the setting of low estradiol levels. It was hypothesized that the expulsion phase was mediated by sympathetic excitation, whereas the emission phase was regulated by parasympathetic excitation6. In addition, sympathetic excitation might be modulated by estrogen, whereas parasympathetic sexual excitation might be dominated by testosterone6. Thus, decreased estradiol values may attenuate the accumulation of sympathetic excitation, which in turn decelerate the expulsion process.

Our study has some limitations. First, estradiol levels in serum samples were not measured using mass spectrometry, which is considered the gold standard method for quantifying estradiol levels29. Second, SHBG was not determined, and thyroid function would be better assessed including free triiodothyronine (FT3) and free thyroxine (FT4)31. Third, ejaculatory function can be modulated by psychological characteristics to some extent35,36, which was not evaluated in this study. Fourth, seminal/infertility status may play a role in male sexual dysfunction35,37. However, we did not evaluate seminal/infertility status of the included subjects. Fifth, our data did not include prostate inflammation, which may lead to an altered perception of the ejaculatory reflex and acquired PE36,38. Finally, some patients with ejaculatory dysfunction preferred self-reported perceived IELT rather than stopwatch measured IELT. Despite this, it should be noted that self-reported perceived IELT has been proved to be closely correlated with stopwatch measured IELT39.

In conclusion, elevated serum testosterone level was an independent risk factor for PE. Moreover, there was a progressively increasing graded-distribution of estradiol values from DE to PE and ED groups.


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The authors gratefully acknowledge Linlin Tian from Department of Microbiology, Faculty of Basic Medical Sciences, Guilin Medical University for the proof reading of this manuscript. The study has been given the grant from Shandong Province Key Research and Development Program (No. 2017GSF218070).

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Study design: J.J.L. and S.T.D. Collection and analysis of data: T.C., F.W., X.L.W., and G.M. Manuscript writing: T.C., F.W., X.J.X., and R.T.

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Correspondence to Jiaju Lu.

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Chen, T., Wu, F., Wang, X. et al. Different levels of estradiol are correlated with sexual dysfunction in adult men. Sci Rep 10, 12660 (2020).

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