What do you mean by etiquette?
If floorcraft is part of that - then that's the only thing I can think of so far - safety of yourself, your partner and others around you.
EDIT: Reading body language signals would be helpful for a couple of guys up here (and I'm sure there are women who possibly need this skill too) - I can think of at least one that looks at the floor and not his partner. If he did look at his partner he would maybe become more aware that she isn't enjoying the dance! If your partner doesn't smile at any point then you maybe need to question why this is the case.
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