In 1987, Alan Dixson reported that the baculum tends to be longer in primate species with extended copulation, and he later published a similar result for carnivores. Yet in 2002 Serge Larivière and ...

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 ...