This might be the most common way of using your cleavage. It actually probably happens accidently quite often. I see all the young ladies who hang their cell phones on a chain or rope around their neck. If they happen to have a big chest and an open blouse then I'm sure their mobile would sometimes get stuck in their cleavage. Probably more common in other countries. Showing that much cleavage in public isn't something you would see much in Thailand.