masturbation
Pronunciation:
/ˌmæstəˈbeɪʃ(ə)n//ˌmæstɚˈbeɪʃən/noun
Definitions
Manual erotic stimulation of the genitals or other erotic regions, often to orgasm, either by oneself or a partner.
Example: Masturbation is our first and natural form of sexual activity and if that's inhibited or damaged, then we suffer for the rest of our lives. ―Betty Dodson
A vain activity.