Hi Op. Firstly I'm so sorry that you are in this situation.
It really seems like you are being clouded by the Dom angle in this, and to be completely honest that really doesn't make any difference in what your husband has done. Doms are there to fulfill a sexual fetish - in that respect it's really no difference than your husband visiting prostitutes.
There is something pretty chilling about how your husband's mind works to be frank and here's why.
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has been doing this for over a YEAR. He has kept this from you for an entire year of your marriage. Its not like he did it once and told you about it, distraught and full of regret. If you hadn't found out he would still be happily lying to your face.
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he has been paying for sexual services, even been on a long distance sexual "regime" of masturbating whilst thinking of another woman. and then he has the gall, the fucking nerve to turn to you and say there was no intercourse, so it wasn't sexual and therefore no big deal. If he had been getting blow jobs for a year from another woman but no sex, would that be acceptable? Should it be your fault for not blowing him three times a day? Frankly this attitude alone would have me kicking him out for good.
He thinks that you are an idiot. Sorry, but if he expects you to accept this bullshit...
- he has asked if you could replace his Dom (that's justifiable murder right there!) But he is just trying to weasel his way out of the shit he is in. If he was really committed to you and your marriage, he would have raised this before now. Maybe not come straight out with it, but slowly, and over the course of time, see if you were willing to introduce slightly more Dom elements into your sex life, and see how you react.
But he didn't do that, because he has a huge Madonna/whore fetish. You are the mother of his children. The safe, dependable wife. The woman who isn't going anywhere no matter what he does (which seems sadly true). The Dom is the whore - the exciting, unpredictable mistress he has to fight to keep every second they are together. Its a short term thrill which lasts a long time since it can end any second. No mundane daily chores, no boring arranging of kids appointments...
Your marriage will never provide that because that would be a shit marriage.
- please do factor your self respect into all this. Can you trust this man after a full year of lies? After paying a woman to fulfill sexual desires that he didn't even tell you he had? you say you should stay together for the children. I see that trotted out a lot on Mumsnet, despite the posters who say that they were products of such a situation and it made them miserable. Miserable to see parents who clearly were unhappy.miserable to see their mother obviously filled with resentment and self hate for having to put up with her lot. And a fuck ton of pressure to somehow make it all worth them staying together.
My personal view is that "staying together for the kids" is often less about the kids and more about a fear of the unknown. Its often a convenient excuse. I'm not saying this is true in your situation, but you should think about what you would do if you had no children, and then do that. Having children does not switch off the part of your brain that regulates self respect.