National Masturbation Month started with a San Fransisco based sex toy shop, Good Vibrations. The owners of the toy shop first started observing Masturbation Month in May of 1995 in an effort to banish some of the taboo and stigma surrounding masturbation as well as to raise money for sex-positive charities. In 1999, Good Vibrations introduced the Masturbate-a-Thon, an event that encourages participants to masturbate in order to raise money for charities and increase awareness of the naturalness of masturbation. Since then, Masturbation Month has caught on in sex-positive communities across the world.