This has to be one of the most common questions about sex. And while more men than women ask it, both are curious about the scientific answer to this question. Based on sexual physiological knowledge, the answer is no, size does not matter. Whether engaging in anal or vaginal penetration, a finger can be just as pleasurable as a penis. When it comes to anal penetration, often a finger is more pleasurable because of the dexterity a finger can provide, especially for a man that likes a stimulating prostate massage. Many women will also say that a finger is better able to tickle her fancy vaginally, especially for those women who feel they have a G-spot. The most sexually stimulating spot on a woman is her clitoris - the glans has over 8000 nerve endings alone! There is also a network of sensitive nerve endings in the outer one third of the vagina, but hardly any in the inner two-thirds. length of the penis doesn't matter physically, and girth, while it can feel pleasant for many women, feels good because the vagina will wrap snugly around the width of what ever is put in it: a finger, tampon, toy or penis of any girth. The pleasure comes from the penetration and technique, not the size. It really is about the motion of the ocean, not the size of the wave. However, for those that do say size matters, this is, like with anything in sex, a personal preference, not a biological fact.