Even tho I saw s many post about Key being completely gay, I must disagree. I think he is bi, because I think he doesn't really care about the gender, as long as there are feelings (and fashion!)
While Jonghyun is gay! If you ask me, Jong is even gayer than Key! And I think they were something, I mean I think that they kissed at least and, when Key was ready to stay with him, the SM decided to put on a show with SSK.
I don't know about Minho, but he doesn't seem really into girls...
Taemin, oh, Taemin... he really confuses me! I think he still has to know himself and what/who he likes!