Reality: This is another case where opinions vary--it isn't exactly the easiest thing to research. But recent surveys have found that most men average somewhere between five and six inches erect. Which means that those blessed with six or seven inches belong to a small, though large, minority.

What to do about it: Stop worrying already. If you don't compare yourself to porn stars or Tommy Lee, chances are you're average size or even above average. (Of course, this doesn't stop some guys: According to the book Useless Sexual Trivia by Shane Mooney, half of the men who undergo penile-enlargement surgery are already within the average range.)