Men & Women & Sex?

I ran this past my wife last night and she was underwhelmed so feedback would be helpful.
I believe that women's curse, yes the one in Genesis, was that they would be willing to do anything to have a relationship with a man. Man's curse (one of them) was embedded in the woman's curse, "they will lord it over them," as is that a man will always want to conquer life - which includes women.
That has led me to the belief that women have been historically willing to trade sex for relationship. I don't mean to imply women do not desire or enjoy the act of physical intimacy only that it is part of relationship and they are willing to enter into a physical relationship if they feel they will in turn have an emotional one.
Men are the reverse of this - they will "give relationship" to get physical intimacy which I believe leads to frustration after marriage when the man feels entitled and the woman feels used.