In America, it’s fairly common for lovers to steal a kiss in public. But try that in another country and you might be met with weird looks.

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Think you know a potential mate by the way they kiss?

Beyond the movie screen, here in Las Vegas you’ll find newly-mets – those who meet by chance on a weekend sojourn – kissing on club floors, in bars, casino pools. Everywhere.

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The music swells. On screen, the two main characters' eyes meet. They lean in, and — slowly! — their lips gently press in a romantic kiss. All the teenage girls in the audience exhale audibly.

For generations, passionate kisses immortalized in movies, songs and the arts have served as a thermometer of romantic affection.

A new study has surprisingly revealed that only 46 percent of 168 cultures kiss as a romantic gesture and many parts of the world are disgusted by it.