I have plenty of geek crushes and a few from real life, and some people I adore without feeling any (sexual) attraction but strong love in another sense.
Geek Crushes past and present list:
1. I used to really like Susan from Doctor Who. That's pretty sad.
2. Then there was that girl in the Dune series.
3. Moving swiftly on to a sucession of Scifi novel heroines
4. ending with the weirdest yet :- Trisha Macmillan...
Honorable Mention
Thom Yorke

(partly because I admire him a lot, he looks great on stage, and I have to put one Radiohead reference into everything I say. Drives my friends and enemies mental, causing the former to morph into the latter)