Wham, based on your last post, I'd say you should flower them. I also thought sexing would be difficult but trust me, it isn't. You'll be able to tell quite quickly the males from the females. Even if you are unsure, you have time - the males tend to show their sex first and you have a good couple weeks between when they first show until they are actually ready to release pollen. You'll know way before then if they are male.
Post some pics of your babies so we can see.