I saw this yesterday. I admit I found the idea of kissing a stranger interesting. My overall impression is that it was kinda sweet; most everyone displayed a tenderness to the act, as if it was a precious thing.
I do wonder whether the participants had a say in the matter - such as the young people who were paired with older people, or the girls who were paired with other girls and guys who were paired with guys. I'm guessing they were "okay" with that.