A man can have any tattoo that he wants. If he wants a unicorn
tattoo, then he can get a unicorn tattoo.
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You can get a butterfly tattoo at any local tattoo artist shop.
This tattoo is the most common tattoo and you will find many
examples of the artwork on the wall and in the tattoo artist's
portfolio.
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That is the correct spelling of the plural of tattoo, which is tattoos.