And you get the positive and negative (more sexual frustration, if you're already frustrated) results of that. The following times I quit for 2+ weeks I ended up feeling pretty normal, but the first time I had to quit after about three weeks as I constantly felt like I was going to explode.

Anyway, if you want to increase your testosterone levels, quitting masturbation is a cheap and effective way of doing so. There are peer-reviewed studies - one I recall mentioned significantly and substantially higher levels after 10 days. I personally don't feel anything until getting to the two-week point.