A lot of times public displays just kinda happen. Sometimes it's just a natural reaction... holding hands, affectionate touches, and the person doesn' t give it a second thought that you're in public. But sometimes PDA's can be like a branding of sorts... like in a bar, for instance, if someone's feeling insecure about the way someone's looking at you, they'll want to show that you're with them by planting a big wet one...
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