I consider myself a lesbian, but is it weird I feel attracted to..?

MTF Transgenders? I know that I don't like guys but sometimes when I see a really gorgeous guy I think, wow he's hot. Or sometimes I see attractive features on a guy. But I also noticed I like MTF Transgenders. I have a huge crush on Calpernia Addams. I never told anyone though! People only know me as being a lesbian. Is this normal?