I've just started wearing diapers with the intention of wetting them multiple times. I can put one on and drink tons of water until I feel like i'm about to burst without becoming aroused, but once I try to let it go, I tend to get a strong erection which takes away my ability to go. If I want to go, I have to push really, really hard, and even then it comes out in bursts and immediately cuts off when I stop pushing. Once i'm done the involved muscles hurt, and I don't want to do any permanent damage by pushing it out like that. Is this a common problem to have in this sort of situation? I know being able to just lie on my back and let it go would feel amazing, does anyone have any tips for just letting go, or is it something that will just come with time?
Also, how long is it generally considered "safe" to wear a wet diaper before you have to worry about getting diaper rash?