The simplest way to capture the differences between men's and women's sex drives is to consider how you'd answer this test: create a sentence using the words "sex" and "love."

If you're a woman, odds are your sentence goes something like this: "When two people understand each other, trust each other and love each other, then the sex is the best." If you're a man, chances are your sentence more closely resembles this: "I love sex."

It's a stereotype, it's a cliché and, more often than not, it's true. "We like to think of men having the higher sex drive—it's not always true, but more often, it is," says Eva Ritvo, MD, vice chairman in the department of psychiatry and behavioral science at the Miller School of Medicine, University of Miami.

"Each person's sex drive is like an appetite: Some people spend their whole life in the kitchen and think about food all the time; some people can skip lunch," says Ritvo, who is also chair of the department of psychiatry and behavioral medicine at Mount Sinai Medical Center, Florida.

As a rule, men don't like to skip lunch. But that's only the beginning of the story.

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