Why do people let dogs lick their mouth?

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My boyfriend lets his dogs lick, or excuse me, "kiss" his mouth and then tries to kiss me! Wtf. That's not attractive at all. And then tells me how not gross that is and how weird I am. Why do people do that? I'm afraid this is going to be an issue when we live together, because I absolutely am not ok with doing that, I don't even handle food after touching an animal unless my hands are washed. What to do?
Why do people let dogs lick their mouth?
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