Self service has many benefits, including improving one's mood and making one feel more confident. It also carries no risk of pregnancy or disease, so long as one's hands are clean.
While masturbation may refer to an activity that involves a partner, such as mutual masturbation, self service typically refers only to solo sexual activity. However, there is a sexual position called self service, in which a couple faces one another while they masturbate. The couple typically sits facing one another, slightly reclining, while they watch each other masturbating. This position is popular because it’s visually exciting and because it teaches people how their partners like to be touched.