Protecting your tongue isn't going to be enough unless you never take any part of your tongue that touches her back in your mouth until you've removed the "tongue condom" and washed. You'd need whole mouth protection...thus its probably not a good idea...
While I wouldn't reccomend stranger sex at all absolutely use a condom, and still try and be sure she's not infected with anything before you "go in" so to speak. Condoms aren't 100%...
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