Right so I've been training for the navy for a while now doing various exercises and seeing good improvement which I'm happy about, but as I went for one of my tri daily wanks I started to wonder what muscles are at work, must be a few especially if your wanking through bordem, the ones where you need to work harder to finish, so for the more educated of you why the hell haven't us wankers got different sized muscles on one side? what muscles are used? also how many calories are burnt in a reasonable lengthed wank? Just in case, you are to use a standard grip on penis method while sitting for all findings and reports. Wasn't sure where to post this, was very tempted to post in health and fitness.