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They are a romances with vampires. You'll find them discussed under paranormal.
Dark Hunter series by Sherrilyn Kenyon is the darkest of these three. About Greek and Roman gods and the vampires they cursed/created.
Carpathian by Christine Feehan, much more standard romance structure. Very alpha male.
Argeneau by Lynsay Sands has much more humor and puns. Bottled blood.
I don't think any of these books are great art. But I do read them. Not really horror.