If going without masturbating makes you more intense, then I think that's more of a psychological thing like Mojo said. I don't think it's a buildup of testosterone or anything. I'm sure there are medical studies that show abstaining increases testosterone, but I bet you could find studies that show the opposite. Either way, I bet the increase/decrease is negligible, or at least not enough to make a noticeable difference in your voice, energy, pheromones, etc.
I see it more as an inner game thing. If you don't masturbate because you know you're going to get laid, then you will subcommunicate confidence in the field. However, if you go out sarging one night and you masturbated five times that day, then you are probably not going to subcommunicate the qualities of a guy who gets women.