Is this just my imagination, or is masturbation actually a good workout for your arms?
Probably neither – unless your penis is several feet long, you stroke with both hands, and your technique requires as much effort as using a Bowflex or Nautilus, the "workout" from masturbation is negligible. What may be happening is your muscles may just be developing normally as part of the puberty process – this tends to happen even to guys who don't do strenuous workouts. (If you're in your 50s rather than your teens, though, this probably isn't the explanation!)
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If you're straight and use gay porn, how would you feel if someone found it?
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After masturbating for a while now, I've noticed that my triceps have gotten quite firm.
