The anus is surrounded in its length by folds called anal valves, which converge at a line known as the pectinate line. This represents the point of transition between the hindgut and the ectoderm in the embryo. Below this point, the mucosa of the internal anus becomes skin. :397 The pectinate line is also the division between the internal and external anus.
^ Weiss, Margaret D.; Wasdell, Michael B.; Bomben, Melissa M.; Rea, Kathleen J.; Freeman, Roger D.; Xue, H; Yang, H; Zhang, G; Shao, C (February 2006). "High Prevalence of Sexually Transmitted Diseases Among Men Who Have Sex With Men in Jiangsu Province, China". Sex Transm Dis. 33 (2): 118–123. doi:10.1097/01.olq.0000199763.14766.2b. PMID 16432484.
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Even though serious injury from anal sex is not common, it can occur. Bleeding after anal sex could be due to a hemorrhoid or tear, or something more serious such as a perforation (hole) in the colon. This is a dangerous problem that requires immediate medical attention. Treatment involves a hospital stay, surgery, and antibiotics to prevent infection.
OK, so here’s where we get into some interesting G-spot and P-spot territory. The G-spot is thought to be a cluster of vaginal, urethral, and clitoral tissues and nerves, Dr. Chinn says. While the exact location of this cluster varies from person to person, some people can feel it when they put pressure on the front vaginal wall, about one or two inches inside the vagina. The emphasis here is on “some.” There’s actually a pretty big debate about the G-spot in the sex education and medical fields.
“I hate to say I'm not a big G-spot believer. There certainly are some nerves, but [research hasn’t] been able to anatomically demonstrate much on a regular basis,” Mary Jane Minkin, M.D., a clinical professor of obstetrics, gynecology, and reproductive sciences at Yale Medical School, tells SELF. “I think women have areas that are more sensitive than others, individual exploration is good, and individuals can experience stimulation in all sorts of places."
The other benefit of starting slow is that you'll build arousal, Pitagora says. "Use slow and gentle stimulation of the area around the anus, the anus, the area just inside the anus, and of the prostate (if your partner has one)," they say. Being fully aroused makes any sexual experience better, but in the case of anal sex it will also help you relax.
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.