Actually I'd bet that neurologically sex is far from power games, but along each growth the system gets used for personal benefits rather than union. Might be a cultural lens too.
Actually, in a human hierarchical society, power is all about sex.
Explain that to me, is that a self gene natural ladder ?
Competition to get at the top of the hierarchy, and the fact someone will be willing to compete, coupled with the intrinsic need for control which comes with power, sex just being a tool to an end... Especially in a culture as puritan and easily offended (only "in public") as the North American culture.