TV for me? Amanda Donohoe's C.J. Lamb on L.A. Law (the first bisexual regular character on American primetime television). I'd already had a thing for Michele Greene's Abby Perkins, and the two of them almost getting together...um, yeah, that messed with my mind a bit. ;-)

In text, more recently, Niki Ky in greygirlbeast's novels Silk and Murder of Angels.

No historical fictional crushes come to my mind, at least not yet.