Why does great sex so often fade for couples who claim to love each other as much as ever?
Why does good intimacy not guarantee good sex, contrary to popular belief?
Can we want what we already have?
Why is the forbidden so erotic?
What is it about transgression that makes desire so potent?
For the answer, check out this excellent TED Talk by Esther Perel, the author of Mating in Captivity.