‘Porn stars’ caught having sex in public - Thai police promise swift action   Thai caption: From foreign website Picture: Sanook   Police suspect porn stars were responsible after a clip circulated online of a couple getting down and dirty at a university in Bangkok.   Pol Lt-Col Anan Worasat, deputy chief of the Bang Khen constabulary, told INN that he had got his hands on CCTV and would soon get to the bottom of it.    He said that he hoped all