The police are searching for a couple who performed sex outdoors at a university in the Bang Khen area.
The cops suspect the act was filmed by a foreign producer so the content could be sold to porn website subscribers and members of secret chat groups.
Officers are examining footage from security cameras to gather more clues and believe the couple are part of a gang of Thai and foreign actors.
"They might star in R-rated movies," police said yesterday. They believe the production team intends to shoot more films in public as "ordered by customers". They include roadside areas, stairs, and lifts in apartments and schools.
The police launched a probe after the video clip, believed to be recorded near a tennis court inside the university, was shared online.
The recording lasted for 10 minutes.
By law, people who perform lewd acts in public are subject to a maximum fine of 5,000 baht.
