I don't think there's any great mystery to writing female characters, so long as you talk to them. If you lived in a monastery and never met any women, maybe it would be difficult.
I was reminded that when we lose and I strike out, a billion people in China don't care.
Often as a child you see someone with a learning disability or Down's Syndrome and my mum and dad were always very quick to explain exactly what was going on and to be in their own way inclusive and welcoming.

