One of our son spent a summer insisting he was called Amy !!!! He also dressed in his sisters clothes , he's now in his 20s and show no tendencies to cross dress or have a sex change! It was an odd summer to say the least
I get the impression that's quite common Slave. Remember my brother going through a dresses stage too. I think it's just trying out the other gender's behaviour. Probably girls do it too but we don't notice as much.