I've done it from day one of being Bethany. Not because, I feel I should, to look more female, but because it is something I have always wanted to do, but wouldn't as a man.
What I can't understand though is why 'old man' cross there legs. Just does not look right to me.
It is (and should always be) a female thing. The same as a guy sitting with his legs apart (is a male thing). If a female sat with her legs apart, it would look wrong...