Masturbation is a sin?

The Bible On the matter of masturbation, the Hebrew and Christian Bibles are silent, neither denouncing nor encouraging the practice. The biblical story of Onan is traditionally linked to referring to masturbation and condemnation thereof, but the act described by this story is coitus interruptus, not masturbation.[5][6][7][8][9] There is no explicit claim in the Bible that masturbation would be sinful,[10][11] however Leviticus chapter 15 in the Law of Moses states that if any man's sperm fluid gets released outside of intercourse, then he shall wash all his flesh in water, and be unclean until the evening.