The Sexual Health Channel explores the functions -- and dysfunctions -- of the reproductive system. Learn about maintaining a healthy sex life and avoiding and treating sexual problems.
  • Male Reproductive System
  • Female Reproductive System
  • Contraception
  • Sexual Dysfunction
  • Sexuality



When it comes to sex, what is normal, exactly? For most issues, "normal" spans a pretty broad range. But life with these unusual sexual conditions definitely isn't typical.

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The Sex Drive Quiz

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.

Why do some species change sex?

In high school biology, we're taught that biological sex is a game of X and Y. In recent decades, though, scientists have learned that things might not be so clear-cut. That may seem unusual to us, but it wouldn't surprise a clownfish one bit.

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