Got it from the Cambodias UK-Embassy-Website (also a note for me as a rookie here in the Kingdom):
Personal Behavior
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Polite behavior is welcome everywhere. What is considered polite in other countries is probably considered polite in Cambodia too. However, there are few customs, social and religious taboos.
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Cambodians admire a calm and considered approach to all aspects of life. Open show of temper and anger should be avoided.
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It is considered a grave insult to touch another person's head, even if is meant as a friendly gesture.
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Use the right hand to accept things or shake hands.
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It is considered rude to point your foot at a person or object.
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Keep an open mind and do not demand much from your host. Loud voices and boisterous behavior are considered impolite. Smiling and nodding establishes good intent.
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public displays of affection between men and women are frowned upon.
If you like someone to come over to you, motion with your whole hand, palm down. Do not signal with your finger.
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When picking your teeth with a toothpick after a meal, it is considered polite to hold the toothpick with one hand and to cover your open mouth with the other.
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In private homes, it is polite to remove your shoes when entering the house.
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Be appreciative of people who appreciate