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Letters to Nature
Nature 226, 869 - 870 (30 May 1970); doi:10.1038/226869a0

Effects of Sexual Activity on Beard Growth in Man

ANON

DURING the past two years I have had to spend periods of several weeks on a remote island in comparative isolation. In these conditions I noticed that my beard growth diminished, but the day before I was due to leave the island it increased again, to reach unusually high rates during the first day or two on the mainland. Intrigued by these initial observations, I have carried out a more detailed study and have come to the conclusion that the stimulus for increased beard growth is related to the resumption of sexual activity.

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References

1. Hamilton, J. B., in Biology of Hair Growth (Academic Press, New York, 1958).
2. Strauss, J. S., and Pochi, P. E., Recent Prog. Hormone Res., 19, 385 (1963).
3. Ismail, A. A. A., and Harkness, R. A., J. Endocr., 34, xx (1966).



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