Why do vampires slick their hair back?

Answer 1

A common mistake amongst those who follow vampires is that they attribute the quirks and mannerism of a single individual to the entire species. For example Count Dracula was a particularly complex and twisted individual and had a number of quirks:

• could not pass over moving water
• couldn't stand garlic
• was intimidated by the sight of the crucifix
• slept in his coffin
• had psychic abilities, could mesmerize animals and humans
• could shape-shift, in the extreme
• loved deeply

And because he was a vampire, people think that all vampires have all the same traits. They do not.

Its the same with the hair thing.