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Published online 8 June 2005 | Nature | doi:10.1038/news050606-5
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Mixed-gender pornography boosts sperm
Men facing images of sexual competition may be more fertile.
It might sound unlikely, but men looking at explicit pictures of two naked men with a naked woman have been shown to produce higher-quality sperm than those watching pornographic images featuring women only.
Although this seems to go against common perceptions about male sexual preferences, it is consistent with the theory of sperm competition, says study leader Leigh Simmons of the University of Western Australia, Perth.
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