Female led relationships discussion

I’ve been considering fitting D Rings into my shower stall to lock my pet inside while we shower together. The more I contemplate this, the more I notice how men struggle to avoid getting erect when they soap up. This usually leads to them masturbating in the shower, what bad boys! I think it would be perfect to have a way to instantly blast freezing cold water right before they plan to cum. Just picture it… supervising every shower and flipping that cold water switch every time an erection appears. I wonder how long it would take to retrain a man’s brain to never get erect in the shower again? **Weeks, Months or Years? **