self-abuse 
noun [mass noun]
1Behaviour which causes damage or harm to oneself: he drove us stupid with tales of his past self-abuse...
- The fun is all in the self-absorbed self-abuse, the modern rules of attraction and dating, and a complete over-the-top obsession with music.
- As for anything in a multiplex, forget it, unless you're into aural self-abuse.
- Today, back to the self-abuse I call ‘two-a-days’ at the gym.
1.1 euphemistic Masturbation: prostitutes were thought preferable to the guilt and fear induced by self-abuse