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Geo,
I had a similar issue awhile back. Everytime I wrapped I would get a semi erection. Pissed me off too no end.
Had no explanation for it. I just would pack the hanger and wrap away and say to myself “I’ll be back”
So now I’m back and abit wiser for it but still have a long way to go, and I will get there.
GMJ
Masturbation before hanging seems to be a good solution to prevent erections. Hanging is exciting at first because you know you are creating a larger penis. After you hang for awhile you will get accustomed to the routine and will be less likely to get hard (maybe).