What purpose does the penis serve? Why is it that members of one species have no penis at all, while those of another have two? Why do they vary so much in shape and size? And where do vaginas, or the ...

Bestselling author Eliot Schrefer's new book, Queer Ducks (and Other Animals): The Natural World of Animal Sexuality is a winner in many different ways. Among the numerous accolades for this young ...

We already know that kink-shaming isn’t a good thing. Even if some forms of eroticism can be questionable, you’d be surprised to know how “vanilla” we, humans still are compared to other animals.

Relationships can be complicated, especially in the wild. There are dozens of ways for creatures to couple up, whether they’re microscopic bacteria or massive jungle mammals. But as is true for human, ...