The way I look at it is: the female form is already incredibly alluring. I've never seen a tattoo that improves upon it. Some don't detract much, but others detract a lot. So at best I'd say they're not a turn on. At worst, a definite turn off.
This contrasts slightly with piercings in my experience. While some piercings (like nose, eyebrow, lip, labia) I feel detract from appearance, others (like ear and navel) can heighten appearance. So it runs more of a gambit than tattoos do.
Obviously just personal preference, and ultimately not the biggest factor if I'm hitting it off with someone.