Heated disagreements about sexuality and gender are front and center in today's culture wars. Evolutionary biologist Nathan H. Lents argues in his new book, The Sexual Evolution: How 500 Million Years ...

[Apologies to readers who have been asking for more on female libido. I've been dealing with book galleys, but appreciate your interest.] Women aren’t the only female primates who make a lot of noise ...

A new study comparing 59 species of primates linked same-sex sexual behavior to scarce resources and more predators in socially complex species. The findings show diverse sexual behaviors are common — ...