Cause of rebirth in six realms
Hell beings, hate or uncontrollable rage
Hungry ghost, misery or self centeredness
Animals, ignorance or stupidity(obstinancy?)
Human, lust and greed
Asura, jealousy or covetousness
Heavenly beings, pride or arrogance
Masturbation is an act of assuaging lust, an unwholesome act
perpetuating rebirth, but not enough to be in hell realm.
But, perhaps, if one develops a guilt complex, and have
afflicted with so much self hatred and creating negative bad karmic
acts towards oneself and others that one falls into the hell
realm!