Tattoo should be respectful and artistic. I'm fine with the display on Pin-Up women, but a body full of tattooes are overrated and look like garbage.
I like women to have some tattooes in certain areas of their body that makes them more sexy or sensual, like ankle, writs, lower back, center of their nave(spot between their neck and their top of their breasts) and stomach. Facial tattooes are out, because it does nothing to enhance a woman's face.
That's my take. Again, this is based on their own level of self-respect, similar to the piercings thread you opened.