How to Sign "Masturbate"
This video demonstrates two common variations of the sign, typically used to distinguish male and female anatomy. For the first variation (male), hold your non-dominant hand in front of you with the index finger pointing upward. Wrap your dominant hand around the index finger in a loose fist and slide it up and down a few times. For the second variation (female), hold your non-dominant hand flat with the palm facing down. Form an 'open 8' handshape with your dominant hand—an open hand with the middle finger bent forward—and stroke the tip of the middle finger back and forth across the back of your non-dominant hand.