Mr. Prasad, I think you meant offspring and not sibling!
But otherwise you are right on the money. Females are often viewed as property or chattel (as I think Amala said). In the good old days, people would be worried about protecting their land, their cows and their women. Nobody would be thinking about protecting men. It is just about safeguarding one's reproductive rights, like one's right to food and shelter. Traditionally women in most cultures really didn't have reproductive rights. That is now changing, and hence this question.
BTW, this is also true of other mammals such as tigers, elephants, seals, and deer. The male of the species maintains a harem of females. The female is allowed to mate only with one individual but nobody questions who the male is mating with. Man, after all is also an animal!