I know that the French movie "La Boum" did a lot of change in the Thai teenager behaviour. But even, you'll hardly see a Thai couple hugging each other at the airport without being stared at. 34 years immersion in Thailand and still counting.
At the immigration, they will check your insurance validity, it's written on the OA visa. If validity is less than one year, let's say 3 months, immigration will put an entry stamp for 3 months and tell you to contact your local immigration when you extend your insurance to be allowed staying more time.