The primary dangers of anal sex include a high risk of sexually transmitted infections like HIV due to delicate tissues, physical injuries such as micro-tears and fissures from a lack of natural lubrication, and potential long-term muscle strain leading to bowel control issues.

Physical Injuries

Tears and fissures: The tissue inside the rectum is thin and does not make its own wetness. Friction can cause small cuts.

Hemorrhoids: Pressure can make swollen blood vessels in the area worse or more painful.

Sphincter damage: Rough or fast penetration can harm the muscle ring that controls the bowels, leading to rare cases of leakage or poor control.

Infections

Higher STI risks: Small cuts let viruses and bacteria get into the blood fast. The chance of getting HIV is much higher during anal sex than vaginal sex.

Gut bacteria: Bacteria and parasites from the bowel can spread and cause other sicknesses if they move to the mouth or a partner's genitals.