Anyone have one testicle or hooked up with a guy with one ball?

It's always struggle to decide to tell someone before hooking up that you've got one ball or do you tell them after or do you wait for them to notice. Is that something that should go in a dating profile too. Looking for advice from guys with one nut or have dated/hooked up with a guy with one testicle or if they had a prosthetic put in too?