This will be my last contribution to this ridiculous discussion.
Therefore he's hot. I know that on this site and to people with screennames like yours "hair is everything" but the fact is there are many ways to be hot, and most people don't care about hair as much as we do. The guy married to Gal Gadot can pull NW4, the guy in the opening post cannot. The differences are due to bone structure and body fat percentage, possibly other variables too.
She can get laid any time she wants, however what she now has a very solid relationship with a great man. The cost of jeopardising that are high -- losing an excellent marriage. However, if she's with a man who isn't satisfying her, she will stray much more easily.
Because he's worth caring about.
He is fat, he has a significant double chin, and probably a beer belly too. I'd estimate that he buys size 36 pants or higher.
Dude, nobody gives a f*** about "excuses to cheat", that's not how things work. It's not a morality play. Human beings are animals (Biology 101) who respond to incentives (Economics 101). Excuses are irrelevant, it all comes down to cause and effect.
Overall, a woman will be less likely to cheat, and to seek better, if she is with a satisfactory man. Sometimes people stray regardless, but it's also known that people stray when they are in subpar relationships. It's a natural process.