Two or more boys in skin tight t-shirts joined at the off-centre lip ring because they think they're the most sought after spectacle around and are breaking all bonds of conformity, despite the fact that they all dress exactly the same, all listen to the exact same music, all kiss each other because they can't get any girls to do it for them, and inevitably, will all have the exact same myspace picture of their clumsy, adolescent embrace with the caption "romanceXcore<333".
Far from being an act of teenage exploration which can be fondly recalled in years to come, most boys who succumb to the urge to lick the teeth of their mates will be haunted by not only the act, but by the publicity they craved in doing it and the fact that the only publicity they got was from their female friends who will never look at them twice, saying "aww cute lol xXx <3". This guilt spiral will continue until, one day, they do what they threatened to do all along to get attention from the friends who were all threatening the exact same thing, and slit their wrists the wrong way, bleeding into unconsciousness and waking up in a psychiatric unit where they get nailed relentlessly by their room mate.
Of course, this is exactly what they wanted.
I think we've all seen way too many examples of emo boys kissing.