The media equate a man's penis size with his power and masculinity. Views about penis size were assessed in an Internet survey of 52,031 heterosexual men and women. Most men (66%) rated their penis as average, 22% as large, and 12% as small. Self-reported penis size was correlated positively with height and negatively with body fat level.

Whereas 85% of women were satisfied with their partner's penis size, only 55% of men were happy with their penis size, 45% wanted to be larger, and 0.2% wanted to be smaller.

Satisfaction did not vary across age groups from 18 to 65. Men reporting a larger-than-average penis rated their appearance most favorably, suggesting a possible confidence effect of perceived large penis size.