Your DNA wires you like that becaue evoloution says it's the strongest chance of producing offspring which are your own. If women are off fucking half the tribe then when she gets pregnant no one knows who the fuck it belongs too. A la, you get wiped from the gene pool becaues no offspring.
It amazes me how people think that their societal conceptions should trump nature. The next serveral generations are going to pay for these miscreants.