The 10th annual fund raising Masturbate-A-Thon is set for this Saturday at The Center for Sex & Culture, located at 1519 Mission St, San Francisco. Both competitors and non-competitors are welcome, although non-competitors are required to pledge of a minimum of $20. The event is expected to last until around 9 p.m. and will be webcast live at Masturbate-a-thon.com from 4-9 p.m.