Human Rights vs Men & Women Rights?

As I was reading chapter four, the concept that caught my attention was the distinction between basic human rights and the rights of individual men and women. "the difference between the sexes is fundamental to the nature, situation, and self-image of every women. Hence legal distinctions between females and males are not always arbitrary and unjust" (pg 79). Thus far in class we have asked whether we have moral rights or not? Now we need to ask, if we do have moral rights, are they the same for both men and women? Seemingly, there is an obvious difference between men and women. Yet in the legal world the trend seems to be towards having men and women be equal in certain regards (claiming men and women should treated equal because they are human) and unequal in other regards (claiming women should get special rights because men and women are biologically different). Wellman writes, also on pg 79, "For many purposes, sexual differences are biologically superficial and irrelevant to the proper social roles of men and women". I guess the question I have is, how much should the biological differences of men and women impact our conceptions of moral and legal rights as individuals?