So I remember reading a meta on John/Teyla a while back, and I think it was someone who doesn't usually write JT so I don't believe it was anybody here. But there was a comment that stuck with me and it was that (paraphrasing) there was a very short period of time in the beginning of the series when John and Teyla first met that starting a relationship of some kind would have been "easy", but that time has passed. She wasn't using this as an argument against JT, just an observation. And I thought I'd toss it out there as a possible conversation starter.
Or you can just ignore this. I won't be offended ;)