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According to the CDC women in that age group average 4.2 sexual partners in their lifetime.
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According to the Guttmacher Institute the average age people have sex for the first time in the United States is 17 years old.
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While it's not common there have been occurrences where "penis captivus" has occurred according to BBC.com.
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According to an article in the Guardian there have been multiple cases where people have suffered amnesia after sex.
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The female clitoris is about the size of a medium zucchini.
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According to a study of 15,000 penises from around the world the average size of the male penis is actually 5.16 inches.
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According to the National Survey of Sexual Health and Behavior this is true, while 85% of men report that their partner had an orgasm in their most recent sexual event.
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According to a study by Helen Fisher, Ph.D. of over 5,000 Americans 35% percent of single American men claim to have faked an orgasm.
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According to the Institute for Psychological and Sexual Health the average for a male ejaculation is 28 mph.
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According to a study by the University of Groningen in the Netherlands couples were 30% more likely to orgasm with warmer feet.