I keep thinking, you can't really be bi if you like only totally feminine boys dressed as girls etc.
That is because of the image, you are (technically) pansexual by that nature to a certain degree, maybe gay, but certainly not bi, because the image of boy is subjected to a girl-ified state, hence your focus is the feminine presence on the boy.
I may be thinking too much.
(that said, I did for a while try to seduce a guy once... it wasn't very successful since I... definitely did not match the criteria)
I think if you enjoy both sets of plumbling, then you're bi. It doesn't really matter how "masculine" or "feminine" they appear.
Does that mean I'm bi then?
You are whatever you are, the labellings doesn't matter.

But strictly speaking, if you have the capacity to be sexually attractive to both XY chromosomed or XX chromosomed people, then yes you are technically bi.
Of course, gay/straight/bi can never really accurately describe anyone who could be attracted to someone intersexed or hermaphrodite, and people still argue whether a man loving a MtF or female loving a FtM would be considered gay, straight, or bi.
I'm sorry if I keep repeating myself, I feel like I've been ^^;