I do peer tutoring, but if someone asks me a question I don't know the answer to (which can vary between never and quite often, depending on the subject matter), we look for the answer together, whether it would be in the book, in their notes or by asking one of the teachers.
About asking stupid questions in class, I would tell your students that "honest questions are never stupid ones". If someone wants to ask you a question, but doesn't want to in class, publicly let the class know that you'd be willing to answer individual questions one-on-one after the class is over.
Is making out (public display of affection) against the rules? If so, I would call them on that and see what their response is. If it isn't (and you're allowed to make your own rules, as long as they're reasonable), I would make this one of your rules. If kids are concerned with making out with one another, chances are that they aren't paying attention to the teacher, which violates the rule of respect.
I hope this helps and I'm not just confusing you more.
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