there are two types of guys that are married. the ones that love it and want to have a wife with a family and the ones that got suckered into it.
the ones that got suckered in are the ones that have no sex, no fun and no life. I have plenty of those guys as friends, they all complain about the same shit... "wife sucks," "i hate my life," etc.
of course if you don't try and keep your woman occupied and happy, she will stop putting out.. duh! thats why idiots that get married after dating for 6 months wonder why things go south... because SHES BORED!
Keep things interesting and things will be good.
No on the other hand, you have crazy bitches that go full psycho after marriage, demanding kids, pushing their family on you, complaining because you work to much, they cant spend enough of your money, etc.
In that case... best to just RUN!