Police raided a gay sauna in the Ratchadaphisek area after a tip-off that an act of group sex would take place on Sunday night, involving 100 Thais and foreigners.
Details are fuzzy, but sources suggest an act of group debauchery may have been planned. However, police did not arrest any of the revellers there as no used condoms were found, said Huai Khwang police chief Kampol Rattanaprateep.
There were three piles of unused condoms. Urine tests were conducted on 40 people at the scene, with substances detected in two of them. They were taken to hospital for further examination which found the substances to be from medication.
Pol Col Kampol said some people at the scene escaped through the back door. He did not know how many, but insisted no police were involved in escorting them out. The owner of the sauna was charged with operating an entertainment venue without a licence and selling alcohol without a permit.
In Febuary, a raid by police in Pattaya found a sex workshop being run at a hotel meeting room. The 10 participants were charged with working without a permit and staying in the country illegally.
Among those arrested were Belarusian escort Anastasia Vashukevich and the workshop's coach Alexander Kirillov. They were charged with soliciting prostitution and conspiracy.
The arrest put Ms Vashukevich, aka Nastya Rybka, in the limelight after she claimed she was the "missing link" in the probe into Russian meddling in the US election.
