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.
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A true fetish is the sole key to a person's arousal, but in the more common use of the term, a fetish simply plays a supporting role. What are five of the most common?

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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.

10 Causes of Testicular Pain You Shouldn't Ignore

If you're like most men, you'd rather ignore the pain than go to the doctor and talk about pain "down there." But in many cases, trying to pretend the pain away could mean worsening your problem -- even to the point of needing your testicles removed.

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