Great Ying Yang symbol, very appropriate for discussion of gender roles!   It's important to notice that there isn'y just one 'right' point of balance on the Ying Yang, that shows black/white, men/women, male/female in perfect and equal balance.  Instead there is a continuous blend of both black and white all along the dividing line, and in very different proportions.   

That's the reality -  we all contain parts of the human masculine and feminine qualities, each of us finding our own unique blend of both.  Those who seek rigid definitions of male/female are ignoring the facts of life.  We are more than just a physical being.