That's a sociological concept actually, one that's much discussed in relation to the sociology of sexualities. In a long time from now, that will probably be the norm. Almost everything will be sexually and gender neutral except for the most basic things (like your actual sex). That will be a much better, progressive future, but it's a ways off. In truth, the ancient civilizations (like the ancient Egyptians) were actually far more progressive in many ways than our current societies, but the Christian Dark Age messed everything up. This is actually one of many concepts I like to discuss. It's nice to see others do too.