The average American man's penis is 5.6 inches (14.2 centimeters) long when erect, a new survey of 1,661 men finds.
One study found that ideal penis size depends on a person's height, and another showed that girth matters more than length to most women.
In the new study, Debby Herbenick, a researcher at Indiana University, and her colleagues asked 1,661 men to measure their penis's length and girth for the purposes of fitting for a condom.
Not surprisingly, penises come in all shapes and sizes. The smallest erect penis in the study was about 1.6 inches (4 cm) long, and the largest was 10.2 inches (26 cm) long.
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The average penile girth was about 4.8 inches (12.2 cm).
Moreover, all erections are not created equal, the study also found. Different methods of obtaining an erection may lead to different size measurements — men in the study who became aroused through oral sex reported larger penis size on average than those who attained erections through fantasizing, Herbenick said.
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The study found that other characteristics of a man, such as his race or orientation, weren't good predictors of his member's size.