I have no idea why some women marry the men they do. I've just heard from my best friend from high school, who married a fussy little man I wouldn't want for a lunch buddy. After 20 years and 3 kids he eloped with a priest. (Male and C of E.)
As to why get married, I believe the institution was invented because it takes at least two people to manage a toddler.
I've bought a house, and it would be very conveniet to have a man in it, to shovel snow, if it snows again, deal with car stuff. (No woman likes to go to a garage, and men do.) change the lightbulb on the front porch, and other guy stuff.
Of course my one time male housemate seemed convinced that his parts would fall off if he did anything I asked him to do.