Pre-Porn is an essential ingredient for a nice long jerking session. This is what you view before jacking or jilling off, in order to prepare yourself for your masturbation session, and can include things like: work-out videos, underwear models, and various slightly sexual gifs.
"how long do you masturbate?"
"oh, about an hour or so."
"really? for an hour?"
"yeah, but a fair amount of that time I'm just watching pre-porn."
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