It makes sense from an evolutionary perspective: a woman who's turned on by everything and everyone that fucks her has better odds of surviving. Which is really fucking convenient when Grug tribe comes by to beat your husband to death. The women who flew into a rage, tried to attack Grug tribe and then died by virtue of being fucking incompetent didn't pass down their genes. The ones that got impregnated on top of their husbands' still warm corpses did. 