Okay, I'm not going to address later posts really, but more the OP's observations.
Anthropologically and biologically, relationships and sex are based entirely on reproduction. Women's reproduction is limited by their biology; how many eggs they produce, how often one matures, what time of the month they have sex, etc. Men's reproduction, on the other hand, is limited entirely by access to females. Want to contribute to the next generation? You have to find a female and THEN impress her and get her to have sex with you. At the right time of the month, too.
It is interesting to note that during the less fertile periods of their menstrual cycles, women prefer men like their fathers. Safe providers, usually more caring. These are the men they usually remain in relationships with (or marry) because these men are more likely to become better caretakers for their children. The fact that they have sex with them during less fertile times of the month contributes to a monogamous bond between the two.
At the more fertile times of the month, though, women often "go for" the attractive, muscular, "impressive" males who will contribute more desired evolutionary attributes to their children.
So, when women cheat on their husbands, they are often more choosy and it is most often during their most fertile time of the month. Because women's reproduction is limited by biology and time, and because they have a much larger investment in offspring, they are more choosy when approaching mates. When men cheat on their wives, they often go "lower" in standards.. because they can reproduce with any (fertile) female, contributing more of their genetic material to the next generation.
I can find some of the articles from a previous class discussing these things, if anyone wants to read them. I'm an anthropology nerd, so I love this kind of stuff.
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