Put a lock on it! Absolutely seriously. It’s the one great denial advantage any of us born with penises has over those who weren’t. Female chastity belts are mostly uncomfortable and the good ones cost a fortune. Cock cages though, cheap, comfortable, and very effective.
My first recommendation is something like the CB6000S (unless you’re seriously endowed, small is better), as you have 25 different size options to experiment with. And then get something pink, or metal, or whatever you fancy once you’ve got used to it.
And then? Enforced self containment. Lock it on, put the key in jar of frozen water, or give it to a friend…and learn that anal stuff is so much harder, and all the better for it.