Are we secretly attracted to ourselves?

Here's a disturbing thought: humans are sexually attracted to -- guess who! -- themselves. At least that's one of the conclusions you could draw from a 2010 study conducted by psychologist R. Chris Fraley at the University of Illinois. Fraley told Wired magazine, "People appear to be drawn to others who resemble their kin or themselves."

In the United States, marriage between cousins is a controversial topic, though it is legal in about half the states. Molly and Cristen explore why marriage between cousins is considered taboo in some places in this episode of Stuff Mom Never Told You.