The development of the anus was an important stage in the evolution of multicellular animals. It appears to have happened at least twice, following different paths in protostomes and deuterostomes. This accompanied or facilitated other important evolutionary developments: the bilaterian body plan, the coelom, and metamerism, in which the body was built of repeated "modules" which could later specialize, such as the heads of most arthropods, which are composed of fused, specialized segments.
3. Once you are both used to it, I find that often her lubrication coming out from vaginal sex and all over my penis when I pull out is all I need for anal penetration. (Tried the first time after 5-6 regular anal encounters.) Just warn her before you switch, or make sure you know her body enough before you try this without a warning. Depending on gravity and how excited she stays, I often find that she stays almost as wet in the back as the front… but she REALLY likes it as she can have multiples “back to back” in either entrance!!! Before we met, she was 35, she had tried anal once and hated it, and had only had 6 orgasms total during intercourse in her life, now she has 6 in a row or more just during the anal part of things.
6. Pay attention the butt cheeks too! Just because your ultimate goal is the butthole, doesn’t mean you should totally ghost your partner’s butt cheeks. Sadie Allison, founder of TickleKitty.com and author of Tickle My Tush–Mild-to-Wild Analplay Adventures for Every Booty, recommends starting off with a sensual booty massage. Using lube, “place your thumbs in the creases where the legs meet the butt cheeks and glide your thumbs along the crease from the inner thigh area to the outer side. Lift and repeat. Then, put your palms together in "prayer position," placing them on their tailbone and gliding up and down their buttcrack."
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There is less research on anal sexual activity among women who have sex with women compared to couples of other sexual orientations. In 1987, a non-scientific study (Munson) was conducted of more than 100 members of a lesbian social organization in Colorado. When asked what techniques they used in their last ten sexual encounters, lesbians in their 30s were twice as likely as other age groups to engage in anal stimulation (with a finger or dildo). A 2014 study of partnered lesbian women in Canada and the U.S. found that 7% engaged in anal stimulation or penetration at least once a week; about 10% did so monthly and 70% did not at all. Anilingus is also less often practiced among female same-sex couples.
General statistics indicate that 70–80% of women require direct clitoral stimulation to achieve orgasm. The vaginal walls contain significantly fewer nerve endings than the clitoris (which has many nerve endings specifically intended for orgasm), and therefore intense sexual pleasure, including orgasm, from vaginal sexual stimulation is less likely to occur than from direct clitoral stimulation in the majority of women. The clitoris is composed of more than the externally visible glans (head). The vagina, for example, is flanked on each side by the clitoral crura, the internal legs of the clitoris, which are highly sensitive and become engorged with blood when sexually aroused. Indirect stimulation of the clitoris through anal penetration may be caused by the shared sensory nerves, especially the pudendal nerve, which gives off the inferior anal nerves and divides into the perineal nerve and the dorsal nerve of the clitoris. Although the anus has many nerve endings, their purpose is not specifically for inducing orgasm, and so a woman achieving orgasm solely by anal stimulation is rare.
Unfortunately, there’s a bit of a catch here. When you poop, your body should expel all the stool in your rectum, but some fecal matter might get left behind. While you probably don’t have to worry about pooping on your partner, you should know that they may be exposed to some visible or invisible fecal matter, Dr. Chinn says. No one needs to panic. It’s as simple as washing it off with soap and water (or changing the condom), washing your hands, and continuing on with your life, whether or not that means getting back to anal sex. But it’s definitely something that all parties should be aware of before you start.
^ Joann S. DeLora; Carol A. B. Warren; Carol Rinkleib Ellison (2008) . Understanding Sexual Interaction. Houghton Mifflin (Original from the University of Virginia). p. 123. ISBN 978-0-395-29724-7. Retrieved November 6, 2011. Many men find anal intercourse more exciting than penile-vaginal intercourse because the anal opening is usually smaller and tighter than the vagina. Probably the forbidden aspect of anal intercourse also makes it more exciting for some people.
^ Ken Plummer (2002). Modern Homosexualities: Fragments of Lesbian and Gay Experiences. Routledge. pp. 187–191. ISBN 1134922426. Retrieved August 24, 2013. The social construction of 'sex' as vaginal intercourse affects how other forms of sexual activity are evaluated as sexually satisfying or arousing; in some cases whether an activity is seen as a sexual act at all. For example, unless a woman has been penetrated by a man's penis she is still technically a virgin even if she has had lots of sexual experience.
The anus (from Latin anus meaning "ring", "circle") is an opening at the opposite end of an animal's digestive tract from the mouth. Its function is to control the expulsion of feces, unwanted semi-solid matter produced during digestion, which, depending on the type of animal, may include: matter which the animal cannot digest, such as bones; food material after all the nutrients have been extracted, for example cellulose or lignin; ingested matter which would be toxic if it remained in the digestive tract; and dead or excess gut bacteria and other endosymbionts.
Relaxation is key and also making sure you're lubed up. "Like first timers, I mean really wet and slippery trust me sometimes that's the number one problem! The best sex position I've ever felt it in was laying on my stomach and he sneaked it in between my cheeks, laid down on top of me and rubbed my clit with one hand while supporting himself with the other, and whispering dirty things in my ear while nibbling on it," says Jillian Janson, an award-winning adult star.
Take things slowly, use plenty of lubrication, and stop if it becomes too painful. Don’t aim to have full penis penetration your first go-round. Try using a finger, and then upgrade to two or three fingers. A toy might be a good option, too, as you grow more comfortable with the sensation. After the first time or two, you and your partner will likely find that the pleasure trumps any initial discomforts.