Girls, why won’t my girlfriend let me use her body as a canvas?

We have been dating for 3 years. I have tried to convince her to let me paint her body and boobs multiple times. But she doesn’t like the idea. I think I would be a good memory and fun quality time. I told her she can paint me too if she wants. I really can’t understand why she would be so against it. We are very open with each other and comfortable being naked around each other. Can someone help me understand or help me convince her it would be fun. Thanks for the help!

Girls, why won’t my girlfriend let me use her body as a canvas?
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