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tube, but has a subtle curve to it. The lower part of the rectum curves toward your navel. After a few inches, the rectum curves back toward your spine, then toward your navel again. The rectum and colon both curve laterally (from side to side) as well; whether to the right or the left will vary from person to person. These curves are part of the reason that anal penetration should be slow and gentle, especially at first. Each person’s rectum and its curves are unique, and it is best to feel your way inside the rectum slowly, following its curves, rather than jamming anything straight inside. Just as the vagina is most sensitive at its opening, the anal opening and anal canal are more sensitive then the rectum.

    Illustration 2: Anorectal Anatomy

    A person’s butt is as
unique as a fingerprint.
    —BERT HERRMAN—

The G-spot
    Men’s and women’s anal anatomy is very similar with one important difference: women have a G-spot and men have a prostate gland, both of which can be stimulated during anal penetration. Named in honor of the German gynecologist Ernest Grafenberg who was the first to write about this sensitive spot in the 1950s, the G-spot is also known as the urethral sponge. 4 The G-spot is located behind the pubic bone; it surrounds a portion of a woman’s urethra, and can be felt through the front wall of the vagina, about an inch to two inches inside the vaginal opening. It’s much easier to find the G-spot when a woman is aroused, because during arousal, the sponge will swell and become more pronounced. If you slip a finger inside the vagina and curve toward the front of the body , you’ll locate the G-spot, which will feel spongy, a distinctly different texture than the smooth tissue around it. For many, but not all women, stimulation of the G-spot is very pleasurable and may lead to orgasm. Most women who like G-spot stimulation prefer firm, deliberate pressure and stimulation rather than a light touch. The urethral sponge contains paraurethral glands and ducts that fill with fluid; some women are able to ejaculate this fluid. This is known as female ejaculation or vaginal ejaculation.
    So what’s the G-spot got to do with anal pleasure for women? During anal penetration, especially in certain positions, many women can experience indirect G-spot stimulation. A thin membrane is all that separates the vaginal cavity from the rectal cavity, and if pressure is applied at the
right angle during anal penetration, the G-spot can be stimulated. In fact, plenty of women can have what they describe as a “G-spot orgasm” (the same orgasm they have from direct G-spot stimulation) during anal penetration, and some can ejaculate from anal penetration alone. Because it develops from the same embryologic tissue as the male prostate gland and produces fluid similar to prostatic fluid, the G-spot is often called the “female prostate.”

The Prostate
    The prostate is a gland that surrounds part of a man’s urethra; it’s behind the pubic bone, below the bladder, and above the base of the penis. A mass of muscle, glands, and connective tissue, the prostate is about the size and shape of a walnut; it produces ejaculatory fluid that combines with sperm and fluid from the seminal vesicles to create male ejaculate.
    Men can experience direct prostate stimulation when they are anally penetrated. You can find the prostate two to three inches into the ass and toward the front of the body. Like the G-spot, it’s easiest to find when a guy is turned on. As he becomes aroused, the prostate gland fills with fluid, swells, and becomes more prominent. Prostate stimulation can be a big source of pleasure for men; it can enhance genital stimulation as well as lead to orgasm. Many men can have an orgasm without ejaculation or ejaculate only prostatic fluid as a result of prostate stimulation. For more information on prostate stimulation, see chapter 12.

    Illustration 3: Male Anatomy

     
    NOTES
    1 Jack Morin, Anal Pleasure and