As science advanced from philosophy to empirical knowledge, groundbreaking discoveries -- like the five on this list -- revealed a lot about the reproductive equipment inside human bodies. Which revolutionized our understanding of sex the most?
WHAT'S INSIDE: SEXUAL HEALTH
- Male Reproductive System
- Female Reproductive System
- Sexual Dysfunction
Most men and women have an active libido, though the relative strength of that sex drive can vary significantly between people and over time. Grab a few minutes to take your sex drive knowledge for a test drive.
Try to estimate when you're ovulating and have sex regularly -- that's the basic recipe for getting pregnant. But what about when you're NOT trying to make a baby? Do you know the ins and outs of how not to get pregnant?