No privacy to masturbate. Dear Alice, i.e., a tie or a ribbon, to signal that you don't want to be disturbed. It could also be a note that says. WebMD explores some little known things about male masturbation and answers questions such as: What You Need to Know; Male Masturbation: 5 . This may sound silly but I'm a 15 year old girl I want to masturbate without my parents knowing. The only opportunity I get is at night in my room, but I'm afraid because I don't want my parents to hear me or anything.