No urine , feces , cutting, *** , no permanent marking or scarring. These are all a hard NO. Soft limits - light choking/breathe play , light flogging and spanking. Anything else - just ask, we can talk about it.
The only way to make sure your ( possible) marriage work is to be 100% open and honest with him. If he really cares he will understand. He might even be agreeable to the situation. If he is totally un- accepting of your lifestyle maybe you would be better off without him.