Harboring a naughty sexual fantasy? You're far from alone. Your desires likely fall into one of three titillating scenarios. Is your interest aroused?

Do you have a type? More than one, perhaps? Find out what goes on when we're drawn to someone sexually and the many factors that fuel these turn-ons.

Birth control has been around for millennia, so why isn't it better? From the pill to IUDs, discover why pregnancy prevention remains such a challenge.

Where do babies come from? Medical advances mean more and better reproduction options. So why do so many people still struggle to conceive a child?