#15. VARYING PENIS SIZES
Time to dust off your ruler, fellas. Researchers at the University of California-Los Angeles and the University of New Mexico Albuquerque surveyed 75 women on their preferences for penis length and circumference. The magic numbers are 6.3″ in length and 3.8″ around for long-term partners. One-night stands measured in at 6.4″ long and 5″ around.