As women behave worse, men happily follow along.
I think this is very true and very telling. Women have a lot more influence over the conduct of men than men do over their own conduct. That's not to say men are not responsible for their actions, it's just that women are in a better position to hold men to a higher standard of conduct and make it work, than men do of holding their fellow men up to a higher standard of conduct.
As for bad parents, I saw a 'porn star in training' Halloween costume on a precocious little girl this past season. Well, there you go!
When men fail to live up to their moral obligations and begin cheating and womanizing (just to mention a couple of bad habits,) I can't imagine today's women putting up with that kind of behavior. In the old days, women used to take it and adapt to all sort of injustices in the name of preserving the marriage. The answer tended to be "well, he's a man, and men do those things."
Today, women are less willing to take this kind of abuse, and I can't blame them. They are more savvy, are better prepared, and often have comparable - or superior - earning power as compared to their spouse. If I were to marry a cheating husband, a philander, or a sex manic who can't get enough from his wife but is in need of sex anywhere he can find it even from porno magazines, I'd be part of the 51% statistic, because there is no way on earth I'd put up with an individual like that. That's the main reason couples should spend time knowing each other well before they get married, even if that takes a long time.
Likewise, if women behave badly in the marriage, I can't imagine a man putting up with that kind of behavior either, thus divorce becomes a quick solution to end a bad relationship.
However, marriage is a sacrament which should be honored and respected equally by husband and wife, and it shouldn't be treated cavalierly as just another social event. It's a serious endeavor where the children often suffer the consequence of failure.
I think like in anything else, you need to know each other well, and a dose of good luck doesn't hurt, either. :-)