As for testosterone levels- there will be an immediate, temporary drop after you ejaculate- but it recovers quickly with rates being affected by your age and fitness levels.

a rough estimation ( depending how long you do it how you do it) it only consumes about 100-150 calories.. so not much at all. otherwise there would be no fat wanker  ;D

You're talking about the cardio though. Following the same logic you would think I think there are no guys with big hands and belly. Cardio and burning fat has a little to do with actual strength workout in terms of calories. I thought about masturbating the same way you for example lift a small barbell. That's an exercise then.

@cyber21:

ur right bicep is bigger than ur left because ur dominant hand is ur right. and u dont only masturbate with that but do everything with it. so its irrelevant.
now considering working out it has to do with hormones. after ejaculation its normal to want to sleep. so u just have to wait till after ure done with the gym (or maybe in the gym, why not?)

Here's the catch. My right biceps isn't bigger. The left is. I masturbate with left hand. I'm not really left handed though as I write or play instruments dedicated for right handed.