Why is there a stereotype that white women have no Azz?

I went to a Yankee Game today and the swarm of voluptuous and bodacious white women were stunning. They had Pretty faces with amazing bodies, they didn't look anorexic and they had nice hips, thighs and azz. I was actually surprised. If I wasn't black I would approach them. So where does this stereotype come from?? White women on T.V are nothing like the ones in real life (or at least NY).