8. Have you cheated on your partner?
We all shake our heads at the high-profile men who stray (here's looking at you, Petraeus) but guess what? A whopping 23 percent of guys have cheated on their mate, according to research published in the Archives of Sexual Behavior. Other interesting findings from that same study: Women cheat almost as much as men (19 percent say they've done it), and people with sexual performance anxiety are more likely to step out.
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