This life is far different from the fantasy, most cum into a tissue while thinking their wife is being fucked, flush the tissue down the toilet and go back to their normal thoughts, life and the admire the mom of their children... the reality is very different to the wanking version.
I have been in this situation endless times with my ex's.
Yes, they got swept up with the sex/ attention etc. and yes, both left me for men they were fucking... but the reality was, they didn't really want to run away with all the men they had fucked (and the men definitely didn't want my ex's) just my ex's didn't want to be with me. Every time they'd have sex with others, they'd then again question/ re-evaluate wanting to be with me.
Then I'd have to work my ass off tryng to keep them, convince them to stay and promise the world to them. (very tiring and very expensive).
I think you have to be realistic, seems like the sexual version of a person who has never travelled, then spent 6 weeks overseas, seen the world and now the travel bug has bitten. Wants to go out and see the rest of the world. She may become bored with fucking around, he definitely will with her, when that is who knows, 3 more fucks or 3 more years?
I have seen a guy totally breakdown after seeing his wife orgasm for the first time with another man. He thought he wanted to see it happen, she'd never been able to have vaginal orgasms in her life and this guy gave her one in front of her husband. She always thought it was her, she realised it was because she didn't enjoy fucking her husband.
For weeks on, she was on cloud nine, finally some one had cracked the code for her... just wasn't her husband. Their relationship went from happy to broken very quickly. They promised no more swinging etc. but for 12 more he still couldn't make her cum and that was it, she couldn't let go of fucking that other guy and decided she can't live in a relationship with the sex they were having. In the end, she left him, he lost his *******... lost the house, his wife, his job and vanished OS running away from the truth.
The biggest issue for her was, not the orgasm she finally had, she really believed they could be swingers and live happliy, but the way he dealt with it, was what finally killed it for her. She just fell out of love with him once he couldn't deal with it, especially as he was the one who wanted it at the beginning.