My preference changes all the time too. When I'm in sub mode, I think about being a 'lee for Michael Pitt, but even when I'm feeling dominant I still go for a similar type. I like my clean-cut guys and I've always had a thing for blonde men, so he fits the bill nicely lol. When I was younger it was Orlando Bloom, I always thought he had a beautiful face, and I wanted to tie him down and torture him lol.
When it comes to female celebs...not many are really doing it for me these days. Every so often I get a crush on a famous woman, but I'm not a big celebrity fan in the first place, so it doesn't happen that often. Oddly, one of the women from Broad City (her name is Ilana, I think it's a Canadian show) kinda tweaked something in me...it's not that she's attractive as such, but she reminds me of someone I used to know. It was someone I had a real rivalry with, and (in my wonderful fantasy mind lol) I knew if she ever got me into a compromising position and realized how much tickling affects me, she would be absolutely EVIL. Gotta love a sadist.