Edvard Munch did not call this painting “The Vampire”, but somebody else did (I think it was a critic / friend of his, though I have not got my Munch book with me right now). I don’t know why people still call it The Vampire, maybe it is because of the whole emo-vampire lame books and movies that pollute our World (I am not including the Swedish “Let the right one in” in this list, since that movie is awesome). I think he called this one “Love and Pain”, though to be fair he did not dislike the vampire interpretation of his friend.
This is what Munch said about this painting in a diary (I got the text from here, though I am almost sure it is slightly different from the one I have in my book about Munch):
He laid his head against her breast – he could feel the blood coursing through her veins – he listened to her heartbeat – he felt two burning lips on his neck – it sent a shudder through him – a shiver of desire – so that he clasped her tightly to him.
Munch used to say that it was just a painting about a woman kissing a man. Maybe it was “just” about that, but as is often the case with Munch, the scene looks rather disturbing.