A masturbate-a-thon is an activity in which participants gather together and masturbate in an effort to help raise money for charities as well as to try and dispel some of the shameful feelings surrounding the act. The first masturbate-a-thon was held by Good Vibrations, a San Fransisco sex toy store, in 1999. Since then, masturbate-a-thons and their participants have raised thousands of dollars for sex-positive charities. These include charities geared toward sex education, sexual expression, and sexual health. Typically, masturbate-a-thons are held during the month of May, which Good Vibrations has promoted as Masturbation Month.