Speaking from the P.O.V. of the wife with a Hubby (now ex) that would hobby....
If he had ever ONCE told me there was an issue and/or he was not satisfied with what he had at home, I would have listened and done what I could to make him happy. Because I love him.
But he didn't. It turns out that it wasn't a lack of sex that made him stray. It was an addiction. NO...he is not addicted to sex. He is addicted to being "naughty". To doing something that is against the "rules". LOL So after he was caught and after A LOT of counseling, and I gave the go ahead to do want made him happy, he wasn't interested anymore.
But then, that could have been because I told him that if he was allowed to his fun, then I would be having mine as well.
I am not saying this is the case for all married men that hobby.
My personal opinion is this....
If a married man is not happy with the sex (or lack thereof) at home, but is happy with all other aspects of his marriage....then it's better to hobby than to have an affair.
Don't confuse sex with love. Just because She has a problem with Her body and sex....that does not automatically mean she no longer LOVES you!