There are likely to many differences in customs and etiquette between the Asian cultures and your home country. However, as long as you are respectful at all times, and use common sense, then you will be shown respect in return and enjoy your time in Asia that much more.
Asian's normally dress conservatively in public places (except for the beach or swimming pool), but especially in temples, churches or mosques. Public signs of affection (kissing, etc.) are best kept private as Asians rarely openly show their affections in public.
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