What should I do about my boss sending me this?

Anonymous
My boss sent me a pic of a vagina late at night. I obviously can not be sure if it is hers. There was no message with it or any follow up or anything. Should I just pretend like it never happened or should I bring it up in a text? We have a good casual working relationship and get along well and joke a lot but nothing like this. I'm at a loss.
What should I do about my boss sending me this?
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