Sex Trivia #2: An Average Sized Penis is Not as Big as You Think

Many people (wrongly)  believe that an average sized erect penis is 7 or more inches. No, no, no!, I want to say, and often do. Most studies of erect penis length come in with average sizes in the 5 to 6 inch range. A 2006 study published in the Journal of Sexual Medicine examined data from two studies and found that the average erect length of the penis was 5.3 inches long.

So, don’t let all those sneaky penis enlargement emails fool you, as they’re the ones often claiming that the average penis size is much larger (sneaky, because then it makes lots of men feel small). An erect penis in the 5 to 6 inch range is an average size and it fits well with the human vagina, which is about 3 to 4 inches long when unaroused and expands a bit larger (around the 5 -6 inch range, though it’s somewhat flexible) when a woman is sexually excited and aroused.

About Dr. Debby Herbenick

Dr. Debby Herbenick

Dr. Debby Herbenick is a sex researcher at Indiana University, sexual health educator at The Kinsey Institute, columnist, and author of five books about sex and love. Learn more about her work at www.sexualhealth.indiana.edu.