I came across this article piece that uses research from 3,000 interviews that highlights why men wife up certain women:
http://www.theminorityeye.com/why-men-marry-some-women-and-not-others/
Long read but I ran across some very interesting highlights...many that are/were discussed here like:
1.) men want women who take care of their bodies
2.) Men may date younger women but often prefer to marry those closer in age
3.) When asked what attracted them to their fiancees, younger men often site accomplishments while older men (over 40) often mention "niceness"
4.) When men say they aren't ready to get married, it's often because they don't think they have enough money
5.) Women who withhold doing household chores earlier in a relationship get more respect
I found this particularly interesting:
"9: The proposal stage
Most men propose after going out with a woman for 18 months.
If at the end of 22 months, a man has not proposed, the chances that he will start to diminish.
For 3.5 years, the chances diminish gradually. After that, it plunges. After 7 years, your chances are virtually zero. "
There are many conclusions on there that I've seen passed around as advice on this board so while there are many unicorns on here and every situation is different, you have to wonder that if you keep hearing the same things over and over....well....