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I'm left-handed and I've always used a computer mouse in my right-hand like a normal person. With this said, I've always enjoyed how natural it is to navigate with my right hand on my mouse while jerking off with my dominant left hand. It's perfect and I don't know how you right handed people even manage.
Back to OP's topic. I actually taught myself to jerk off with my right hand. I'm an ambidextrous masterbater. My right arm used to get tired when I'd try jerking off with it, but I've built up enough strength in it that I can fap with my right as easily as I can with my left.