Love is the wrong word, it's unfortunately massively overloaded and culturally dependent to such an extent that there is very little chance of transporting mean

Love is the wrong word, it's unfortunately massively overloaded and culturally dependent to such an extent that there is very little chance of transporting meaning and understanding with it. I want to replace it with more accurate phrasing, rooted in human psychology. A man gives commitment to get sex. A woman gives sex to attain being provided for and protected.