I think its down to the styling - although the zed has curves there is no frills, not pretty little extras. Its not got a nice smile at the front or a hook for a handbag. Its stupid, irresponsible and solves problems with brute force!
But just because the care has male traits doesnt mean a woman cant drive it. Coming back form the bodyshop on wed I had a nice little play with a z4 and a M3 both driven by women and both fairly "butch" cars.
My zed is definatly a girl btw - it costs a fortune in maintenance and beauty products is unpredictable and is DEFINATLY in a mood with me at the minute for no reason!!
I wouldnt let it bother you TBH