Wow… I was surprised I got so many comments about my stories about male arousals during physical exams. To answer a few of your questions, I’ve never heard of any issues or studies concerning males and repetitive motion injury (carpal tunnel) from masturbation. There are a number of documented cases with females however. (One even sued for Workmen’s Comp in Florida). I would think the reason is simple. The nature of masturbation in men doesn’t really involve a lot of joint movement (no pun intended). ..more.