VERB. Masturbating so as to prevent wet dreams and/or untimely hard ons.
Dude, I can't believe you had a wet dream last night! You really should start using preventative masturbation.
The act of a married, or romantically committed, Man pleasuring himself regularly so as to eliminate the temptation of being unfaithful.
If I didn't do some Preventative Masturbation, I would be chasing after every skank in the neighborhood.
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