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.
Inadequately cleaned toys can serve as a reservoir for bacterial growth and even some viral sexually transmitted infections (STIs). Using a condom with toys – even if you don’t share your toys – will reduce the risk of infections. Hepatitis C, furthermore, can survive as a miniscule drop of dried blood on a toy (or other object) for up to 3 months and become reactivated when wet. (If your eyes aren’t bulging, go back and re-read that last sentence.) (Side note: that’s why sharing cocaine straws is a very real method of Hep C transmission: cocaine causes micro-tears in the nose, leaving invisible specs of blood on the straw that harbor the virus for up to 3 months.) So instead of scrubbing your toys with a nail brush or boiling them compulsively, just use a condom and rinse them off in warm, soapy water afterwards.
Local resection: A surgical procedure in which the tumor is cut from the anus along with some of the healthy tissue around it. Local resection may be used if the cancer is small and has not spread. This procedure may save the sphincter muscles so the patient can still control bowel movements. Tumors that form in the lower part of the anus can often be removed with local resection.
“Awkwardness doesn’t mean you’re not close with your partner or in a healthy relationship, it’s because we’re taught from a young age that sex is a taboo topic,” Levkoff says. “Bringing up to a partner a potential thing that you want to try is going to be uncomfortable regardless of what it is. I think that we forget that a part of sexual intimacy means being vulnerable and being able to have those conversations. That’s a human thing. It’s part of being sexually mature.”
4. You might bleed a little. As always, if you're bleeding profusely or persistently (like, for longer than an hour), you should call a doctor. But a little blood during anal play or sex isn't abnormal. Partha Nandi, a gastroenterologist and health editor with WXYZ-TV in Detroit, tells Cosmopolitan.com the most common reason for bleeding after anal sex is anal tears — small tears or fissures in the delicate anal canal tissue. Before you freak out at the thought of "anal tears," know that most of these are so tiny you won't even feel them, and a lot of them don't produce any blood at all. But, like snowflakes, no two anal tears are the same, so yours may bleed a bit. These little guys should heal within a few days but may cause a bit of mild discomfort when you're pooping.
For people with HIV, HIV medicine (called antiretroviral therapy or ART) can reduce the amount of virus in the blood and body fluids to very low levels, if taken as prescribed. This is called viral suppression—usually defined as having less than 200 copies of HIV per milliliter of blood. HIV medicine can even make the viral load so low that a test can’t detect it. This is called an undetectable viral load. People who take HIV medicine as prescribed and get and stay virally suppressed or undetectable can stay healthy for many years, and they have effectively no risk of transmitting HIV to an HIV-negative partner through sex. Only condoms can help protect against some other STDs.
This advice still stands if your partner ejaculates inside you. Though some people worry this could cause runny poops that resemble diarrhea, Dr. Frankhouse says this actually isn’t the case. For one thing, since poop usually isn’t in your rectum until you’re close to expelling it, there’s no real opportunity for poop and semen to mix. Even if poop could go farther up into your colon, semen is usually runny. Since your anus will likely remain expanded for a few minutes after anal sex, that semen can just leak right on out, Dr. Frankhouse says.

^ 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.
Now that you know how to have anal sex with your man that is both satisfying and fun, my suggestion is that you read the next chapter in the Anal Sex Guide on how to prepare for anal sex. After that, make sure to check out the best anal sex positions and then learn how to eat ass (it can be very pleasurable and super kinky). And if your man is keen on anal play, then make sure you learn how to give him a prostate massage.
Maybe you're super excited to try anal and you want to get right in there — don't. It's always best to start slowly with a new sexual experience, but is especially important when you're trying anal sex because the sphincter muscles in an anus are tightly closed. So, instead of jumping in with a penis or sex toy, have your partner stick one (lubed up!) finger inside your rectum first. Then, slowly add more fingers until you're ready to move on to penetration with a penis or with a strap-on.
Anal sex can exacerbate hemorrhoids and therefore result in bleeding; in other cases, the formation of a hemorrhoid is attributed to anal sex.[3][92] If bleeding occurs as a result of anal sex, it may also be because of a tear in the anal or rectal tissues (an anal fissure) or perforation (a hole) in the colon, the latter of which being a serious medical issue that should be remedied by immediate medical attention.[3][92] Because of the rectum's lack of elasticity, the anal mucous membrane being thin, and small blood vessels being present directly beneath the mucous membrane, tiny tears and bleeding in the rectum usually result from penetrative anal sex, though the bleeding is usually minor and therefore usually not visible.[16] By contrast to other anal sexual behaviors, anal fisting poses a more serious danger of damage due to the deliberate stretching of the anal and rectal tissues; anal fisting injuries include anal sphincter lacerations and rectal and sigmoid colon (rectosigmoid) perforation, which might result in death.[5][93]
Stimulation from anal sex can additionally be affected by popular perception or portrayals of the activity, such as erotica or pornography. In pornography, anal sex is commonly portrayed as a desirable, painless routine that does not require personal lubricant; this can result in couples performing anal sex without care, and men and women believing that it is unusual for women, as receptive partners, to find discomfort or pain instead of pleasure from the activity.[6][38][39][40] By contrast, each person's sphincter muscles react to penetration differently, the anal sphincters have tissues that are more prone to tearing, and the anus and rectum do not provide lubrication for sexual penetration like the vagina does. Researchers say adequate application of a personal lubricant, relaxation, and communication between sexual partners are crucial to avoid pain or damage to the anus or rectum.[2][13][41] Additionally, ensuring that the anal area is clean and the bowel is empty, for both aesthetics and practicality, may be desired by participants.[21]
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The anus is the end of the large intestine, below the rectum, through which stool (solid waste) leaves the body. The anus is formed partly from the outer skin layers of the body and partly from the intestine. Two ring-like muscles, called sphincter muscles, open and close the anal opening and let stool pass out of the body. The anal canal, the part of the anus between the rectum and the anal opening, is about 1-1½ inches long.
Pelvic exam : An exam of the vagina, cervix, uterus, fallopian tubes, ovaries, and rectum. A speculum is inserted into the vagina and the doctor or nurse looks at the vagina and cervix for signs of disease. A Pap test of the cervix is usually done. The doctor or nurse also inserts one or two lubricated, gloved fingers of one hand into the vagina and places the other hand over the lower abdomen to feel the size, shape, and position of the uterus and ovaries. The doctor or nurse also inserts a lubricated, gloved finger into the rectum to feel for lumps or abnormal areas.
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Sometimes women are turned off by the hygienic and health aspects of anything going on in the backdoor. "Many women express concern about this as an issue, but as long as you poop and then everything is cleaned out prior with an enema beforehand, there is very little chance of catching anything in there! I prefer natural enemas with no scent as these tend to irritate the rectum which can lead to a painful experience," says Singer.
While there’s definitely gastrointestinal bacteria in and around your partner’s anus, it’s probably not likely to cause a gastrointestinal illness like food poisoning when you ingest it. The exception is if they actually have a GI issue themselves, Dr. Frankhouse says. It’s a pretty simple rule: If the anilingus receiver has had any unusual bowel movements lately, it’s probably best to take this activity off the menu for now. That includes stool that’s runnier than usual, bowel movements that are more or less frequent than usual, and even irregular anal itching. All of these could be signs that there’s extra bacteria hanging out down there, which is definitely not ideal for anilingus.
With regard to adolescents, limited data also exists.[49] This may be because of the taboo nature of anal sex and that teenagers and caregivers subsequently avoid talking to one another about the topic. It is also common for subject review panels and schools to avoid the subject.[49] A 2000 study found that 22.9% of college students who self-identified as non-virgins had anal sex. They used condoms during anal sex 20.9% of the time as compared with 42.9% of the time with vaginal intercourse.[49]
Receptive anal sex is much riskier for getting HIV. The bottom partner is 13 times more likely to get infected than the top. However, it’s possible for either partner to get HIV through anal sex from certain body fluids—blood, semen (cum), pre-seminal fluid (pre-cum), or rectal fluids—of a person who has HIV. Using condoms or medicines to protect against transmission can decrease this risk.
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.
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