Women's sexual marketability declines with age, so even the hottest HB9.5 will at some point find it necessary to modify her behavior to accommodate a future long term provisioning opportunity. When the guy comes along who meets her own criteria for an LTR/Marriage commitment her behavior has to be changed from one of sexual selection to one of sexual investment. This necessitates a change in behavior, attitude and perspective. This is conveniently called "maturing" by women, but while facing the social and physical effects of aging, she's forced into a position of becoming some one new - particularly in light of not having spent the time and effort in developing herself personally during her formative years.
Few women can outlive their sexuality so they need to form new strategies in order to sustain long term interest in their committed mates. Sometimes this may be a woman having an epiphany and learning social graces. However, more often than not, most lack that insight and are unprepared for this, so they rely on pre-constructed social contrivances (i.e shaming, entitlement, etc.) ready made for them and meant to keep a man in a perpetual state of qualifying to her. How many times have you heard your married friends state "I'm lucky to have her" as opposed to a woman saying the same of her spouse?
Look at it from a societal pressure point of view. If you've got a consistently unfaithful GF in her party years there's really two problems; her own dishonesty and self-expectations of fidelity (really hypergamy) in her age/physical condition, and a guy's expectation that she will, or should be, faithful to him under the same considerations. I have no doubt that there are plenty of innocuous, unassuming Soccer Moms with 2 kids and married for 8 years at 38 who lived entirely different lives in their college/party years. Looking at her coming out of the mini van or at bible study you'd never guess she used to do three-ways with her dorm mate and her BF back in college. Yet there she is getting the kids off to school.
I think it's actually more difficult to get the girl who's been perpetually coddled and primed for a lifetime to be the perfect homemaker. A lot of the marital discord I hear from religious friends of mine comes from this very dynamic. They did everything "by the book" so to speak and the sex has never been anything more that missionary position twice a month for the past 7 years. Social pressure is on her side in this, and again shaming and social conventions arise; "why should he expect anything more?", "what's giving him these ideas of flipping me over and taking me from behind? Porn maybe?"
The long and short is that there is no mythical "Quality Woman". You're always going to exchange advantages for disadvantages. The best you can do is to get close to optimal advantages, but it's important to understand that what you think is important now may not be in the future. However, it's equally important to also understand that what you think "shouldn't matter" or isn't important now, may well be the cause of your divorce in the future.
