In some religions, masturbation is not accepted. Young people often talk about and joke about masturbation. Many adults got negative messages about masturbation while they were growing up - and this sometimes has led to negative feelings about their sexuality as adults. Decide on a response that gets your message across and teaches what you want your child to learn. That is disgusting.
Masturbation is private behavior and young people have a right to privacy.
Masturbation is not good. Do other things will keep you from having sexual feelings. It is normal to masturbate. Religious values can play an key role in sexual decision-making. Follow the teaching of your religion.