If you masturbate in front of someone, not only is it super hot for them, but you can show them how you liked to be touched. These nine people.
Though just to confirm, we asked guys what they thought about their lady masturbating in front of them and their answers made it, well, pretty.
I know in the setting of an adult theater, men will swarm a female masturbating. I' m an known exhibitionist anyway, but in a sex fuelled environment men will be.