“Your anus has thousands of sensitive nerve endings in and around it that can give you pleasure. Most of these nerve endings are concentrated around the opening, but the outer part of the rectum also has them. With the inner part of the rectum, what feels good during sex is mostly the pressure and fullness that comes with being penetrated. While most people need their genitals to be touched during anal sex in order to orgasm, some people can orgasm just from anal penetration.”