Physical abuse is valid grounds for divorce. Around my circle of friends, the most common cause for divorce was the guy's career wasn't going anywhere (or in one case, his business went bankrupt), or he just wasn't exciting any more. How many of your friends were getting beaten up by their husbands? Of those, in how many cases was it the woman who started the hitting?
In the case of adultery, if the wife is in the mood for sex several times a week, and the guy still strays, she has a valid grievance. If she's never in the mood, then she should not appear shocked when the guy finds someone else. I regard chronic, long-term denial of sex to be just as much a violation of marriage vows as adultery.
One friend who’s husband beat her on a regular basis, nothing anyone could say would convince her to leave until one day he put one of the kids in the hospital.
A man does not cheat on his wife because she is not in the mood for sex, she cheats because his heart is not right.
I have never known anyone who got a divorce because the husband was boring or his career stalled or they went bankrupt.
Take that back I remember on e a woman I worked with lost a child in an accident and her husband divorced about a year later. No parent should ever have to bury a child, I think they were just able to work through the pain.
Divorce is very easy these days and I guess you could say when the government decided to define divorce it makes sense the next step was to define marriage.