I think holding hands is okay. I also think a friendly hug isn't too bad either. Definitly much nicer than fighting. Kissing, groping, sitting on other's lap...probably all should be left to private moments. The more intimate displays gross people out, are distractions, things kids would not do in front of their parents (disrespectful).
first come up with your Thesis: Insert your opinion here. (Do you agree/disagree with PDA)
Title: (catchy and itriguing)
Introduction: Something that introduces your thesis with a story or statistics or situation.
And There are 3 reasons that i agree/disagree with PDA. The first is, the second is.., the third is...
Topic Sentence 1: The first reason i agree/disagree with Pda is.. (supportive sentences)
Topic Sentence 2: The second reason i agree/disagree is...(supportive sentences)
Topic Sentence 3: The third (final) reason i agree/disagree is...
Conclusion...Because of these 3 reasons, Pda should be allowed/disallowed in public school.