Probably for the same reason some women like, or don't mind pornography. It's all tribal. A woman who is relatively well off, or creative, or intelligent, isn't usually bothered by porn because she (and her friends) will never have to perform in it.
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I think she's hot, hot, hot and that gives her vagina tattoo bonus points. The cat-nose-and-whiskers, though, makes me wonder. That doesn't seem like a smart tattoo at all.

-- Rear Admiral