personally speaking, i wouldn't use any oil-based stuff in my vagina but i have (and would again) used 'em for anal and i've never had a problem, not once.
*psssst* i am not a doctor...i only play one on tv...... and i in no way shape or form accept any responsiblity for any infections you may incur
(although if there is an infection it would most likely not kill you or her)
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pinky swear!
just do some research and have fun!