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!)
Do you find yourself masturbating more often during some seasons than others? Why?
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