Why you should not make out in public:

• Because you're in public...that means that there are other people around...some of whom you might not even know
• Because people will notice what an awkward kisser you are
• Because you might need to use your mouth to speak (and people will understand you better when you don't have an extra tongue in your mouth)
• Because no one wants to be "that" couple ("that" couple being the two people making out at the bar/party, who, because they are publicly making out, are assumed to be completely trashed)
• Because other people do not need you to make them feel awkward, they can do it themselves
• Because if you're insecure enough to exhibit that much PDA, you obviously care about what people and think. And what people are thinking is, "Ew, why do those two feel the need to make out in public?"