Evolutionary biologist Nathan H. Lents details how animal relationships can offer perspective on sexual diversity, social monogamy and gender identity—for humans.

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 ...

Kate Rodriguez-Clark is an animal matchmaking guru. Among her responsibilities as a population ecologist for the Smithsonian, ...

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.

Knowledge of animal mating systems helped human societies grow, because propagation of domesticated stocks ensured that there were dependable supplies of food (Zeder 2008). When observing wild or ...

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