What does love look like in the brain? What exactly happens to your mind during sex? And what goes on in a brain-on-porn?
The revolution in brain imaging allows us to look at -- and begin to answer -- these questions in entirely new ways. Biological anthropologist Helen Fischer discusses the three brain systems for love: sex drive, romantic love, and attachment. They're less distinct than you'd imagine, says Fischer.
And in response to the passing of Amendment One in North Carolina and President Obama's recent comments supporting same-sex marriage, Big Think blogger Kayt Sukel investigates, "Is what I experience when I feel love qualitatively different from what a man experiences? Or what a lesbian may experience?"