Does penis size matter in sexual intercourse?
Even a penis that remains relatively small during an erection serves every function of a larger penis. A woman's vagina, for instance, adjusts to any penis, no matter what its size, and since the vaginal walls contain few nerve endings, any difference in the woman's sensations depends on the firmness of her muscles surrounding the vaginal barrel as well as psychological factors. The latter is also true for sensations inside the rectum during anal intercourse. There is practically no feeling at all beyond the anal sphincter muscles. (This, incidentally, is the reason why some people who introduce long and hard objects into their rectum may seriously hurt themselves without realizing it.)