I slept in an upper compartment 3 feet above my parents. Try to work harder at that last part. Like homer simpson’s roommates told him, put a tie on the doorknob if you want to be alone with a girl, or a sock if you want to be alone with a picture of a girl. I have never told anyone to tell their roommate that they masturbate. I was working out of town with a friend who is straight.
Avoid eye contact and conversation for three days after the fact. If so, then masturbate when you have privacy and just go to sleep at bedtime. I told my friend about it later and he had a good laugh.