Like other muscles, your anal sphincter is only accustomed to stretching so far. Your anus is full of sensitive nerve endings that make anal play feel oh so good. Anal training can make anal penetration of any kind pleasurable. It can also help you work up to larger anal toys and other butt play, like gaping. This makes it more prone to tearing and infection, including sexually transmitted infections STIs.
13 Anal Sex Tips For Women, Because You Need To Prepare If You Want To Have Fun