I don't think someone is transgender unless...
they have genital surgery. The whole point of wanting to be a woman is to have a vagina. Guys like Jenner want to dress pretty but still use the old joy stick in bed. Doesn't that just make him a cross dresser? As for women they will never have a real penis but taking hormones can make the clit get a bit bigger. I guess that's the best they can do. Either way I don't think they can call themselves the opposite sex unless they have gender reassignment surgery.