I'd never get a tattoo personally but for some reason I do like them on women. And yeah, I guess a lot of it is to do with the "alternative" vibe. Coloured hair is amazing on women as well. Coloured tights (blue or red or whatever) I find a real turn on too, although I guess that's more a certain fey/librarian type look that generally might not fit porn.
All of this is probably an "indie" thing that comes from my music obsession but I think all of these things also hint at intelligence or at least a kind of single-mindedness, which I find very sexy. Lydia Black and Mallory Maneater are probably my 2 fave current LP girls not just because they're great looking and have huge sexual appetites but because they clearly know who they are and don't feel the need to fit into any easy societal category or whatever. They've got attitude and self-confidence, which for me is sexy, plain and simple.
I hate those ear-stretcher earrings but find I can let it slide with porn girls like Lydia or Proxy Paige for some reason. If that's who they are then fine.
Mallory's Slayer tattoo is a bit of a worry, mind - we need to move her on to the good loud guitar stuff like Thee Oh Sees, No Age, Metz, Pissed Jeans etc.

More non-manhandle scenes please. Hands away from face/neck/shoulders. Keep the girls loose, free and expressive. Don't overpower them - let them sizzle! Keep the heels on. More panties pulled to one side. More skirts/tight dresses. More 0% pussy scenes.