Short answers, pulled from the story.
The inner third of the anal canal is less sensitive to touch than the outer two-thirds, yet it is more sensitive to pressure. This tissue is composed of many nerve endings that control the opening and closing of the anus through the internal and external sphincter muscles.
Unprotected receptive anal sex with an HIV positive partner is the sex act most likely to result in HIV transmission. The anal sphincter is a delicate, easily torn tissue that can provide an entry for pathogens, making the risk of injury to a woman during anal intercourse significantly higher than during vaginal intercourse.
Iran's Penal Code states in Article 110 that those convicted of engaging in anal sex will be executed. The manner of execution is at the discretion of the judge.
A 2000 study found that 22.9% of college students who self-identified as non-virgins had anal sex, and they used condoms during anal sex 20.9% of the time. This rate is lower than the 42.9% of the time they used condoms during vaginal intercourse.
The American Cancer Society estimates that in 2023 there were approximately 9,760 new cases and approximately 1,870 deaths in the United States. Most cases of anal cancer are related to infection with the human papilloma virus, which is often contracted through unprotected anal sex.
In a survey of a collection of Moche stirrup-spout pots, it was found that 31 percent of them depicted male-female anal intercourse significantly more than any other sex act. These pottery pieces belonged to the world of the dead, which was believed to be a reversal of life.