I think the most important thing for you has to be you taking care of you. If you choose to stay with him and support him through his healing of the hurts of his childhood that is great, god knows he will need all the support he can get.
At this point in his life, if he is using exhibitionism as a way of dealing with the trauma he underwent then i think therapy has to be a must, i think that should be non negotiable if you intend to stay with him. I am not talking about 6 weeks of sex ed either, he has some serious issues growing and the sooner he faces them and sorts them out the better, it could take a while and it will take some serious hard work on his part.
I wish you both well and i hope that he is able to work through some of the issues succesfully, for both of you.
I asked him about this law he spoke of, he said,,, *watch* he then asked the others to share about their lives,,, the others talked of how things were for them, how things worked in their lives,,, and as they believed, it was so.