This thread has gone completely whack Guys, let us all show respect for one another. I disagree with the lifestyle, but regardless I show respect. We are all allowed to freely share our opinions. Whether you disagree or agree, support or don't support homosexuality, and bisexuality is another discussion. Regardless of whether or not it is canon, we all have the right to believe what we want. Instead of talking about there sexual orientations, I propose we start talking about how it was done.
I personally think that Aang and Katara's relationship was built up much better, and was way more effective than that of Korra's. Think of the long, long buildup over the course of three seasons. Now, if you look at Korra's, sure there was a blush, and they occasionally had a moment together, but everything that they've done together can be considered a friendly gesture. There "moments" are things that girls do with other girls that is completely straight in our every day lives. Aang and Katara's was more distinctive, and they have more clear moments that solidified there love.