Katrina here.
Rules, or not. Boundaries, or not. You play with the fringes of sex and sometimes your 'nose' gets 'bloodied'. Sometimes you orgasm like you never have before. Other times you get 'fucked into next week'. Other times, you get all of that.
Rules, while in the throes of sexual passion are pretty dang foolish. You can have them, yet.... You learn from broken rules, you don't get depressed over it. His greatest fears became real. You agreed to 'terms and conditions' that he should never have asked for in the first place. Meanwhile, when you know you're doing something wrong and still do it, that's not nice either. We've always had sex with a 'no crime, no foul' point of view.
Inaction , lack of transparency and lack of trust placed yourself here. Forgive each other, be grownups and move forward. No one died. You learned a few things.
Being a stay at home mom is a noble pursuit. Yet, if he's endangering his health, that's not how you do that successfully. Frankly as a mother and wife, the fact you have any time for fringe sexual pursuits, tells me that perhaps you're lacking focus .
He needs to get healthy, you need to be Mom and you both need to focus on your marriage for a while. As far as the,"Oh, I didn't get to explore sex when I was younger ." Well boo-hoo-hoo. You cannot change the past and you cannot focus on the present while craving the past.
There's a nifty movie called Eyes Wide Shut. It's about a marriage. The husband is craving a place of sexual adventure and fringe experimentation. What he doesn't know, until later, is that his wife came from that 'place' and now wanted the family and marriage they had. In the end, they both return to their marriage. Not by regretting anything, yet valuing what they were in the present.
Forgive each other. Move forward. Be transparent to each other. Perhaps get a really good marriage counselor where you're honest.
And, once again, for you, some other guys cock is not going to make things better.
I finish this as a woman who occasionally enjoys sex with others. I enjoy it a lot. My sex partners, including my dearest husband, seem to feel the same way. Yet, if it stopped tomorrow, so it goes. Because, it's not the woman who can have one hundred lovers, it's the woman who can make love to one lover, one hundred different ways.