SIN: Thought masturbation was a biological imperative? Think again. It seems some people (i.e., some women) don't know how to pleasure themselves sexually. So, in an effort to assist ladies and their tender needs, Good Vibrations presents "Give Her a Hand: Sexual Massage Course" tonight, where you can learn such perversions as how to use a sex toy; "advanced fingering"; labia diddling; vaginal, clitoral, and anal stimulation.

8 p.m. // Good Vibrations (603 Valencia) // $25-30

THEATER: Set your laser beams to 'navel gaze' as Nina Wise takes to the stage in What Just Happened?, an evening of improvisation based on the prior 24 hours of Wise's life. She uses "contact improv dance," comedy, spoken word, and storytelling to tell you her remarkable life story.

7:30 p.m. // The Marsh (1062 Valencia) // $10-15 (sliding scale)