Hey bak3ed, I'd be surprised if you could identify the sex of the plants clearly at their current stage, putting them into a flowering photo period is the way to have them show it. You can also let them mature enough in veg to the point where they develop full, clearly distinguishable pre-flowers, which are the same as the normal flowers of course just smaller and around larger nodes, but doing that indoors requires quite a bit of space and not everyone has that available, so if you don't I would recommend force flowering at around 6 weeks into veg. Just make sure that it is grown up enough to essentially be a full adult plant, because it will continue to stretch out in size about twice as large during flowering.

As for when can you post pictures.. its either once you've made 25 or 50 posts, I don't remember, but I believe it was mentioned earlier on the first page of this thread. Also in the future its always considered curteous to start new topics of discussion in new threads to help reduce confusion between trying to explain two different solutions for two problems.