Vampires traditionally have been thought of very sexy. There is a few connections I could make between sex and vampires. When a vampire eats he injects his fangs into the neck of his victim. When humans have sex there's also a penetration that goes on. "She wants blood, and blood she must have or die. My friend John and I have consulted; and we are about to perform what we call transfusion of blood- to transfer from full veins of one to the empty veins which pine for him."pg. 129. The connection here with the blood transfusion is how the blood which provides life is flowing through two bodies where in sex there is also fluids that are transferred between two people and those fluids can also provide life.
1) I don't think he was a pervert that's just how people were back in the day.
2) I personally think a lot of monsters could be sexy, not just vampires
3) Sex back in the day was probably thought of as a means to have children and not as exploited as it is these days.
