Last year, over the holidays, the number of searches for incest-themed videos on Pornhub and its competitors spiked dramatically, hundreds of percent in a single month, and only continued to grow all through 2015. So…what the f**k is that about? We asked Jesse Bering, author of "Perv: The Sexual Deviant in All of Us." We also talked about other data, just released this month by PornHub, surfacing a whole new set of super-interesting proclivities (like that the Italians are really into foot fetish stuff). With Allison P. Davis, Maureen O’Connor, and David Wallace-Wells. Learn more about your ad choices. Visit podcastchoices.com/adchoices