Sex partners competition. The potential short-term partner most likely to be infected with an STD would be the one having casual sex and, therefore, least preferred according to this alternative hypothesis; however, the married potential sexual partner was the least preferred.

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Alternatively, role-playing may be sexually arousing to men and women because it exploits mechanisms associated with sexual variety.

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Baker and Bellis interpreted these findings as an young d sex that, when encountering sperm from another male, some sperm impede the progress of rival sperm blockers and some sperm attack and incapacitate rival sperm seek-and-destroy- ers.

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Baker and Bellis interpreted these findings as an indication that, when encountering sperm from another male, some sperm impede the progress of rival sperm blockers and some sperm attack and incapacitate rival sperm seek-and-destroy- ers.







However, recent work on the psychological, behavioral, and anatomical evidence of human sperm competition reviewed in this article had not been considered in these previous critiques.







Evolution, 54,







Show Map.







Thus, circumstances involving imagined behavior might involve encouraging sperm competition e.







In the 2 decades since Smith first argued that sperm competition occurs in humans, this theory has been enriched with new ideas and discoveries.