How much did Nietzsche know about women?

I think Nietzsche was a great philosopher but had the impression he was not very good with women…
I think  it’s highly  likely  it  is a false attribution.And are women more dangerous then men?It’s projection… vagina dentata for example.The vagina cannot bite off a penis.i woman can bit with  her teeth but so can a man.I recall  seeing “Love Bites” on I girls necks when I was young but I never allowed that…. let them bite their food or a bone