Like I indicated, the ones who have unrealistic expectations tend to be women. A fat virgin dude will settle for a land whale waifu more often than not. He is, if not consciously, subconsciously aware of his SMV (Sexual Market Value) and will tend to act in accordance with it however much he may bemoan his fate. Furthermore, he'll actually find contentment in it. At least he got married and had some kids. That's all most men really want, a loving family they can call their own.
If, however, said land whale waifu happened to get porked by Chad Thundercock after he'd downed an entire handle of Jack Daniels on a dare within a few hours one ill fated night (for him), well,
she now thinks that's the bare minimum of quality dude she is
owed by reality. She somehow landed, if only for one night, a dude well and far above what her SMV would say was feasible. Not that the reverse never happens, but dudes tend to get it was a "lucky break" and that it's not really realistic to expect sober HB10's to wanna marry and raise a family with your low value fat ugly bastard ass. It does boost the confidence level though. A confident man fares far better on the dating market than one who isn't regardless of all other factors. Confidence is Alpha after all so in the end he does gain from that ONS. The girls, however, tend to suffer for it because their reaction to it is the opposite of the male.
Girls, given their position as the arbiter of Sex, expect that if she gives a male sex she's entitled to the thing he's the arbiter of, commitment. This is where the whole Christian Virtue comes in. If both sides understand virtue, they both know that they ought to exchange these things in a fair sense. I, the male, swear myself to the female. I commit to her (and make it quite formal in the sacrament of Marriage). In turn, she surrenders herself to me in the sexual act once I have done so. I commit to her and only her, and she surrenders herself to me and only me in the same way. We of course date first, get to know each other and feel each other out under the watchful eye of our parents. Then we make the decision with our parents offering their input.
Provided nobody in this equation has psychological issues it's all pretty damn straightforward and easy to understand. Good Christian Man seeks Good Christian Waifu to marry and raise a family with. That's the whole reason behind Sex by the way and the parents get that. Hopefully, they see the love in the eyes of the hopefully ideally matched potential couple and let it go through despite any misgivings they may have. Redemption arcs are a thing and even a "bad boy" or a "slut" can become a good waifu/husbando if they've put in the requisite work
.