Why do testicles hang the way they do? Is there an adaptive function to the female orgasm? What does it feel like to want to kill yourself? Does "free will" really exist? And why is the penis shaped like that anyway?

In Why Is the Penis Shaped Like That?, the research psychologist and award-winning columnist Jesse Bering features more than thirty of his most popular essays from Scientific American and Slate, as well as two new pieces, that take readers on a bold and captivating journey through some of the most taboo issues related to evolution and human...

"As a sex writer, Jesse Bering is fearless--and peerless." --Dan Savage

"You are a sexual deviant. A pervert, through and through." We may not want to admit it, but as the award-winning columnist and psychologist Jesse Bering reveals in Perv, there is a spectrum of perversion along which we all sit. Whether it's voyeurism, exhibitionism, or your run-of-the-mill foot fetish, we all possess a suite of sexual tastes as unique as our fingerprints--and as secret as the rest of the skeletons we've hidden in our closets.

Combining...