One of the basic properties of life is reproduction, the capacity to generate new individuals, and sex is an aspect of this process. Life has evolved from simple stages to more complex ones, and so have the reproduction mechanisms.

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Sex. Anisogamy, or the size differences of gametes (sex cells), is the defining feature of the two sexes.By definition, males have small, mobile gametes (); females have large and generally immobile gametes ().

When you hear about modern-day slavery, you probably picture some third-world brutality occurring in Africa or Southeast Asia (and if you just muttered something about your unpaid office internship, go ahead and slap yourself right now). When you hear about sex trafficking, you imagine a gang of

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A bout of celibacy won’t have lasting effects on your overall health, but you still could be in for some unexpected changes if you stop having sex.

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Got a headache? Maybe you should have sex after all. “There is some evidence that orgasms can relieve all kinds of pain—including pain from arthritis, pain after surgery and even pain during birth,” notes Lisa Stern, RN, MSN, a nurse practitioner who works with Planned Parenthood in Los Angeles and blogs at Gynfizz.com.