Well, I thought he exhausted all possibility of compromise with her. That's why I didn't mention therapy. Naturally it is better to adapt, but she doesn't seem willing. He said he would still have to support her, even if she remarries. That's why I thought at least she could do his laundry, cook, clean, and whatever she does, everything but sex.
The only advantage to an affair is you don't have to pay for it. A professional escort, on the other hand, isn't going to go apeshit and try to ruin his marriage or reputation, get pregnant, become dependent, fall in love, etc. They value discretion. They value cleanliness and are more health conscious than some random woman, the type which could be picked up in a bar. Plus most professional sex workers are highly skilled and versatile in bed. They are much more willing to cater to a man's needs and desires. However they are not cheap. You have some major misconceptions about sex workers. I have done quite a bit of research into the subject. I have a lot of respect for these women and the services they provide.