WASHINGTON — You fly more than 100 miles for love. You get rejected. You fly another 100 miles. Another rejection. And another. That’s the high-flying but futile sex life of the male pectoral ...

New evidence suggests that Mother Nature has her own means of handling cheating wives. Researchers have found that a gene responsible for semen viscosity has evolved more rapidly in primate species ...

People often ask what kind of human sexual relationship is most evolutionarily "natural." Is human nature adapted for promiscuity or long-term relationships, for example? And if we're wired for ...

“Promiscuous” is a term that is almost always used when speaking about a woman; it is most often pejorative. It refers to a woman—usually a young woman—who has sex frequently and casually. This ...

University of Oxford provides funding as a member of The Conversation UK. Females are coy and males are ardent. This was Darwin’s somewhat Victorian portrayal of the sexes in his book The Descent of ...

RECEIVED wisdom and biological theory both have it that males are (or, at least, would like to be) more promiscuous than females. That does not stop a lot of men settling down happily as faithful ...

In environments where mice compete for mates, the rule seems to be survival of the sexiest. Researchers have found that when female mice must compete with one another for mates, they bear sons that ...

Some male mammals are known to kill babies of the same species. The only trait that really explains infanticide is the possibility for females to breed in any season, according to a study published in ...