Autocoitus 

The act of self masturbation by either a male or female.

Auto: Self
Coitus: Sex

We all know it's physically impossible to have sex with yourself, therefore the act closest to sex with yourself is masturbation... aka: Autocoitus.

Until being caught by her mother, after breaking up with her boyfriend, Jessica spent her weekends alone having autocoitus.

Autocoitus by SmokeyBear November 25, 2013