I think that person was referring to it being dangerous by unnatural orientation. The anus isn’t “meant” to be penetrated and sometimes it can cause injury, especially if the receiver doesn’t take proper hygienic precautions. As usual, first-timers are prone to bleeding just as they would with first-time vaginal sex. This leaves them vulnerable to more bacterial infection than they would be with vaginal sex.
^ Kammerer-Doak, Dorothy; Rogers, Rebecca G. (June 2008). "Female Sexual Function and Dysfunction". Obstetrics and Gynecology Clinics of North America. 35 (2): 169–183. doi:10.1016/j.ogc.2008.03.006. PMID 18486835. Most women report the inability to achieve orgasm with vaginal intercourse and require direct clitoral stimulation ... About 20% have coital climaxes...
Intra-rectal pressure builds as the rectum fills with feces, pushing the feces against the walls of the anal canal. Contractions of abdominal and pelvic floor muscles can create intra-abdominal pressure which further increases intra-rectal pressure. The internal anal sphincter (an involuntary muscle) responds to the pressure by relaxing, thus allowing the feces to enter the canal. The rectum shortens as feces are pushed into the anal canal and peristaltic waves push the feces out of the rectum. Relaxation of the internal and external anal sphincters allows the feces to exit from the anus, finally, as the levator ani muscles pull the anus up over the exiting feces.
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Using protection during anal sex is important to reduce your risk of catching an STI. For penetrative sex, make sure you use a condom and lots of lube – some people feel safer using extra-thick condoms for anal sex. Dental dams also offer good protection for rimming. Taking pre-exposure prophylaxis (PrEP) is another way to prevent HIV infection, but it may not be available everywhere.
Adenocarcinomas can also start in apocrine glands (a type of sweat gland of the perianal skin). Paget’s disease is a type of apocrine gland carcinoma that spreads through the surface layer of the skin. Paget’s disease can affect skin anywhere in the body but most often affects skin of the perianal area, vulva, or breast. This should not be confused with Paget’s disease of the bone , which is not cancer and a different disease.
For some women out there, anal sex is the cherry on top of a sexual sundae: a little extra treat that elevates something that was already delicious on its own (duh, talking about sex here). But for others, it's more like pâté: intriguing enough, worth a try, but absolutely not up their alleys (as in, a penis will probably not be going up that alley ever again).
The tissue and skin around the anus acts as a protective barrier for the bottom half of your digestive tract. However, the tissue inside the anus is thinner, delicate, and more likely to tear and bleed as a result of penetration. This increases the likelihood of passing infections, viruses, or bacteria between partners. Even two partners who don’t have any sexually transmitted infections (STIs) can still pass bacteria between each other through these tears in the skin.