As I said earlier, this approach would be like trying to hold my pee in for too long.
Ok.
Why is castration not an option? I understand that if it has huge social, physiological and psychological implications, but if your mind is set on it, then why not?
There are far safer ways than to take such extreme step. I would not suggest this step to anyone. Sometimes such thoughts come & go with age or you could say temporary, with a step like castration, there could be a lot of repentence later on.