You shouldn't masturbate when people are around.
James suddenly felt horny while sitting at the back of his dorm's lightly populated common room.
James wants to masturbate.
James returns to his dorm room and pulls out his Fleshlight.
James starts surreptitiously masturbating on the couch in the common room.
James masturbates, feels satisfied, and returns to the common room.
Another student spots James while walking over to the water fountain and reports him to the administration.