Get legal advise from a reputable divorce attorney before anything. It may not come to that, but if it does, you'll have the knowledge in your back pocket, and be better to guide you to the next step. Remember, marriage is a lot like sex, it's always better when the man is protected. Just my $.02..
Well, 7.5 and thick would be a bit easier to find, but if you come to the NY area at all, she can easily get gangbanged by a shitload of 7.5 cocks. Good luck with your search..