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How Can I, an Average Guy Who’s Really in Love, Make Sure I Don’t Become One of Those Couples That Annoy the Hell out of Everybody?

A public display of affection — more commonly referred to as PDA — is a bit like the smell of a fart: If it’s your own, it’s inexplicably pleasant. If it’s someone else’s, it stinks of crap. In 2016, researchers looked into why people are so repulsed...