Barkerfan beat me to mentioning The Hunger...
basically, there's no vampire "canon"...everyone interprets the mythos differently, every movie or book is gonna have its own little twist to the way vampires behave...the vampires in Underworld live the sexy lifestyle, big extravagant parties, swank mansions, etc...whereas the vampires in 30 Days Of Night are just fucking animals, no real emotion, just craving blood.
so for quick references:
Bram Stoker's Dracula, Count Dracula was in love with a woman.
The vampires in Underworld seemed pretty hetero; Kraven was lusting after Selene, the blonde vampire chick thought Michael was attractive, etc.
Lestat (as played by tom cruise (i never read the book)) seemed rather foppish, or that might've just been his hair.
the vampiress in The Hunger was explicitly bisexual.