If he is 18 and doesn't need your money to get a tattoo, I'd imagine you have no way of stopping him, as he can just go behind your backs and do it anyways. My sister was not allowed to get her belly button pierced according to my dad, however, she did it anyways and they had NO clue!
I'd say research with him, go with him, and make sure it's done in sanitary conditions. Try to make your husband realize this point, too.
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