Miss N. , I guess you have never been to a gym and take shower with Chinese girl..the majority of us don't and won't shave the hair of that part.
I asked many of my elder friends about that, they said it was because Chinese we traditionally believed that shaving of that part is not good, girls after shaving would become tiger-ghost or something.It is a superstition, of course. But at least it means shaving
there is a taboo for some Chinese...And Chinese men dont like it since they believe girls like that have too much desires...囧
But as I know, some western feminism took that-part-unshaved as a resistence to male authority...such as the drama V-monolog said that.