Hmm. This is a 'rumour' that has been going round for a long long time. I am not sure how to answer this. I suppose the best thing would be to be honest and hope it make sense.
So from my experience and point of view...Here goes.
I am a Vampire and so would love to be able to say to you: "Yes we are the most sexual beings, no-one can resist us no matter how hard they try. We can have anyone we want and have them do anything we want without question or complaint."
From my point of view that woud be superb.

But it isn't true.
We do have a fascination for members of the opposite sex. Both humans and of our own race too. I can switch it on and off at will, and usually have it set to just gently glow in the background. So I am often noticed wherever I go, but not followed or commented on, at least not much.

I can turn it up if I want to, but it isn't really a good idea most of the time.
I believe myself to be a Sensuous and Romantic creature.
I don't know about 'appetites', and I don't think I'd care to discuss them here anyway!
I believe that all kin are sexual in this way to varying degrees, and that all kin are more sexual than non kin. (Many of whom seem to me to have no real appreciation for it.)
Obviously being Vampire I believe Vampires are the most sexual of all the kin types, although I concede that would apply to any race of kin I would be...

I think there is something about the romantic view of Vampires that adds to the mystique of their natures to make a whole that is impressive and striking.
But then that is only my personal view, which I readily admit is frankly biased and openly prejudiced in favour of my kind.
Lady C.