Myth 1: Women can reach orgasm more easily if her partner has a large penis.

Men who have worried for eons about the size of their penis can relax. The truth is that size really doesn't matter all that much. Since only the first two inches of a woman's vagina are sensitive to stimulation, anything over that amount is kind of useful during intercourse, at least from the woman's physical perspective.
In fact, when men are overly concerned with the size of their penis and whether it's sufficient, their minds aren't focused on pleasuring their partner and that is no way to experience female orgasm. A survey done by the Kinsey Institute found that the average size of an erect penis measured from the tip to where it connects with the rest of the body is 6.16 inches in length. The girth of an erect penis is 4.84 inches on average.
Both of these statistics are come as a surprise to men and to women who have been convinced by our culture (and possibly pornographic movies and magazines) that the average size of an erect penis is eight or nine inches. That same Kinsey study actually found that less than 2% of men have penises which meet that requirement.
Remember whether a man's penis size is below, above, or just average, he still has the ability to help his partner reach orgasm and that is far more worthy of praise than a few extra inches of penis.