Postillionage is the act of stimulating the anus and rectum. This act can be performed alone during masturbation or with a partner during foreplay, intercourse, and oral sex. Postillionage is often very pleasurable because of the high number of nerve endings in this area.
There are a number of different ways to perform postillionage. For instance, the anus can simply be stroked or massaged with no penetration. The anus and rectum can also be penetrated with items like fingers, butt plugs, vibrators, and prostate stimulators.