masturbation

noun3

1. •
   Sexual stimulation of one's genitalia or other erotic regions, often to the point of orgasm.

   • Diogenes in sight of all, exercising his Masturbation, bred a longing desire in the bystanders, that in such sort they might fill their bellies by rubbing or clawing the same. — 1603
2. •
   The stimulation of another person's genitals using the hands.
3. •
   (disapproving, figurative) A vain activity that serves only to provide self-indulgent satisfaction without any practical or external value.

   • That experimental film was nothing more than intellectual masturbation for the director.