Evolutionary biologist Nathan H. Lents details how animal relationships can offer perspective on sexual diversity, social ...

One of the most fascinating aspects of human life is how we choose our mates. Animals also choose their mates, sometimes with a great deal of care. Mating systems are important to understand ...

For two weeks every mating season ... proportionally the longest penis of any animal on earth spanning up to 10 times his body size. That's like a human's reaching the length of a bowling lane.

Evolutionary biologist Nathan H. Lents argues in his new book, The Sexual Evolution: How 500 Million Years of Sex, Gender, ...