Kissing in public at this level, Has anyone seen or done? ?

You are extremely disrespectful if you do that in school. All those people who don't say anything are probably just keeping quiet because they figure you are too clueless to listen. It is inappropriate and stupid, to say nothing of your not caring about ruining your girlfriend's reputation. Boys can get away with it more easily than girls, but you are still throwing away the chance to have anyone ever take you seriously.