Masturbation

Masturbation is the act of stimulating one's own genitals for the sake of achieving an orgasm. Its practice varies among men and women of various cultures, with certain religions frowning upon it because it is indulging in the act of lust.

Policy
Like with sex, mentions of this act are acceptable, but graphic descriptions of it are forbidden.

Empath: The Luckiest Smurf stories
It is commonly referred to as "private dancing" among the male Smurfs who engage in it in the EMPATH: The Luckiest Smurf story series, as the Smurfs deal with their feelings toward Smurfette without harming her in the days before the Smurf Village had its first Imaginarium set up.

Hero: The Guardian Smurf stories
It is implied in the HERO: The Guardian Smurf mini-story "Smurfette's Artistry" when Smurfette goes off to be alone with herself in her bedroom with her finished nude painting of Hero, which she painted while Hero was at the time married to Wonder.