also: オナニ
noun, noun or participle which takes 'suru', intransitive verb
Common colloquial term for masturbation; can be used as a noun or with する as an intransitive verb.
from German Onanie
彼は毎晩オナニーしているらしい。
He seems to masturbate every night.
オナニーは健康に良いと言われることも
It is sometimes said that masturbation is good for your health.