So this supposes that the wife doesn't want to divorce despite the betrayal of vows. That would be pretty exceptional given she has all the legal favour to take all she's due in UK law from the common estate i.e. everything she's enabled or enhanced since the beginning of the marriage. If it were fiscal motive then such riches would have to be in the sole trust of punter and ring-fenced from divorce proceeds. Again all seems pretty exceptional circumstances rather than that of Joe punter.
You'll have to explain the mindset of people who spend years in acrimonious bondage to one another and both insist on continuing the situation when an enforceable exit is presented to one or both parties.
No fiscal or financial motives, reasons or caveats, nor is the relationship acrimonious. More than half my friends are female as is my closest friend. My missus has no probs with this. To throw in a bit of context a few years back I found a website called TantricHeart, which I now know to be that of the well known but now retired Savanya. I mentioned it to my better half and described the massage and HE that was promised and she actually suggested that I should try it. I didn't then but wish I had now.
Yes it would cause an upset for a while, possibly longer, if she found out I was punting, but as I've already said, grounds or otherwise, it wouldn’t trigger a divorce. You'd have to be me and live in my shoes to understand that - and it's not overconfidence on my part or keeping her chained up in the cellar - she'd be likely to broach a bottle of 1983 Fonseca just to wind me up.