Vampires are so old that they don't need to impress anyone anymore. They're comfortable in their own skin. It's this enigmatic strength that's very romantic and old-fashioned. I think it goes back to something of a Victorian attitude of finding a strong man who's going to look after his woman.
I'm not convinced that women have the education or the sense of their own history enough or that they understand the cruelty of which men are capable and the delight that many men will take in seeing you choose to chain yourself - then they get to say 'See you did it yourself.'