What does this mean??

"You can tie a knot in a cherry with your tounge, it doesn't mean you are a good kisser... it just means your tounge muscles are strong."

I found that on a website, and it might be dumb to some people, but I have no idea what it means. Could anyone help me??

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Advice for the lovebirds:

**When you're kissing, close your eyes. It's not very nice to stare at someone. You might be wide-eyed at first because you're surprised or something, but then close your eyes.

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