Well, there's dirty and then there's old---and then there's reptilian.
But I think that Iggy Pop is a perfect example of what I originally intended with this thread. His skin is leathery, his hair is long and stringy, he's just plain dirty. But he holds some inexplicable appeal just the same. He's a dirty old man, but I have a crush on him just the same. Tom Waits, too: he's odd, reclusive, and dresses like a 1930s hobo, but he's hot.
Sure, most women will admit to loving the Sean Connerys and the Paul Newmans out there, but how many also like the Anthony Bourdains and the Nick Caves?