Maryland researchers have set out to find one of the most important questions in humanity: What causes penile fracturing, and why does it often happen when a man is cheating?

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The researchers investigated over four years 16 cases of men whose penises ruptured to the point of requiring surgery. The study, published in the Journal of Sexual Medicine, showed that half of the men were injured during intercourse with someone other than their wives. Essentially, the cause of fracturing is "stressful situations," and cheating can qualify. It's also possible that the location had something to do with it: Three patients were in a bed, but the rest were in cars, elevators, and at work.

Take the advice of the research institution that brought you the longest-flying human-powered helicopter and can turn thoughts into movement: Keep it in your pants.

[NBC Washington]