Those women’s beauty was “neutralized” by their incompetence or their behavior during intimacy that chilled romance, or by their being boring in bed and not offering a sexual experience that’s “spicy” enough to keep the guy’s interest in the long run.
Just like a woman who was bored on a date is not going to return that guy’s call or text, the guy who has been bored with his girlfriend or a wife in bed is going to start looking for an adventure an excitement on a side.
This is especially likely to happen if that guy had experienced great and exciting sex in the past with you or with some other woman, and he is looking for an equally good experience today.
As humans societies have evolved from hunter-gatherers into civilized societies, there have been substantial changes in relations between men and women, with perhaps one of a few remaining biological constants being that both adult women and men must have sexual intercourse for human procreation to happen.
Humans have been compared to other species in terms of sexual behavior.
Sometimes, they guy would be cheating on them with some random girl that he met at work or at a bar, while at other times it would be someone the girl knew fairly well or it was even her friend.
Being scarred by prior disappointments in guys who cheated on them, many women are unable to enjoy their present relationship, even when everything seems to be great, because of that constant fear that sooner or later their boyfriend, or a husband will cheat on them, just like the others did in the past.
Few men will stick around and appreciate a woman who is a mediocre sex partner.
I have seen many guys dump very beautiful women for that exact reason.
Some men “settle down” or marry while they still have this urge to have new and multiple sexual partners and many of them act on it.
Thus, no matter how wonderful their girlfriend or wife is going to be, they will not stop pursuing new interactions with women and new sexual experiences.
Men’s tendency to cheat on the women they date and even have strong feelings for is one of the most common and the most painful issues that women have to deal with in their relationships with guys.