Tattoos are regarded by many as a form of art, though I just think that it ruins the skin.
When I think of women with tattoos, I think of attention seeking behavior. This holds especially true if the tattoo's on their lower back, which they purposely expose. It's as if they want to be the center of attention. If I meet a woman with such a tattoo, I always wonder if she's going to have the "it's all about me, me, me!" attitude in a relationship.
It's a bit shallow and just a way for the more boring ones to start a conversation.