In other words...when you're pleasuring yourself, how often do you use stored mental images of hot guys you've seen while you're out and about? It could also be a steamy past sexual experience, something you saw on a television show, etc. Basically anything stored in your HEAD that you go back to for jerkoff sessions.
I tend to use porn more, but I do make the occasional visit to stored memories. I must say that something about using ONLY what you have upstairs does make for a more intense release. You have to use your imagination...
And for the other side of the question: how often do you make 'deposits' into your spank bank? Do you see someone (or something) hot each day? maybe a few times a week, or perhaps once a month? that is forever stored with the potential to be used during your alone time?
For me: I'd say at least three times a week. Hell--my partner even gives me great material. How boring is that? lol