Underworld (2003)
Synopsis: "Vampires and werewolves have waged a nocturnal war against each other for centuries. But all bets are off when a female vampire warrior named Selene (Kate Beckinsale), who's famous for her strength and werewolf-hunting prowess, becomes smitten with a peace-loving male werewolf, Michael (Scott Speedman), who wants to end the war. Think Romeo and Juliet with a big hickey! The Blu-Ray version of this film is unrated."
Synopsis compliments of Netflix