When it comes to penis size, the politically correct party line is "size doesn't matter." But let's get real, shall we? Even tampons are available in junior, regular, and super sizes, and some women (myself included) are the proud owners of dildos (a sex toy used for vaginal or anal penetration), in sizes ranging from diminutive to gargantuan.
The truth is that size matters, but not necessarily in the way you might think.
It's not that bigger is necessarily better, but that different sized or shaped phalluses can stimulate a woman's vagina in different ways.
But first, a little about me. I'm a lesbian sexpert and author of The Whole Lesbian Sex Book. Now, you're probably thinking, who am I to be telling guys how to please a woman through intercourse? Admittedly, I have little sexual experience with men. But as a lesbian, I have an abundance of experience in pleasing woman through penetrative sex (that's where those dildos come in handy). And I've had quite a bit of experience talking with my male friends about sex with women.
Magical Mystery Tour
Before we get to the "use what you've got" lessons, let's begin with an anatomy tour of the vagina. The opening of the vagina sits below the clitoris (the most sensitive area on a woman's body; most women require direct clitoral stimulation to reach orgasm) and the urethral opening, and above the perineum and anus. The vagina is made up of very elastic tissue that opens up and expands during arousal (and childbirth). When a woman is not aroused, the walls of her vagina touch. Contrary to what you might think, girls do not have a big "hole" in there.
The vagina isn't a passive receptacle, either. The opening of the vagina is quite muscular and will contract with pleasure when stimulated, gripping a penis or finger.
The outer third of the vagina contains the most nerve endings, and most women find it to be more sensitive than the deeper areas of the vagina. The opening and G-spot are responsive to a range of touches; the deeper areas are more responsive to pressure or thrusting.