Amusing article on Buzzfeed showing how nothing can stand in the way of personal grooming.
12 Female Characters Who Keep Shaving Despite Constant Peril
Of course this is a light-hearted piece, no one is suggesting that any of these programs and films were supposed to be realistic but armpit hair is obviously thought of, like toilet arrangements, as just too grim to be shown.
I shall be paying close attention to armpits in future dystopian viewing. 