I just don't want to watch anybody making babies. If you can make out in public and not be nervous about it, by all means shove your tongues down each others throats. There is a right and a wrong place for that sort of thing. I mean, like, have you ever been to a big/busy airport? People are practically humping each other left and right with all of these separated lovers. xD But at school, unless you're about to die or something, I don't think you should be making out. Kissing, like pecks, is fine and all.
I feel so nervous with pda but perhaps that was because I was with a girl? We held hands occasionally but I was afraid to get shot down by some homo hater. xD