Thailand has vowed to tighten oversight of tourists' behaviour after a series of incidents involving foreigners caught having sex in public, warning they damaged the country's image.
Tourism is vital to the southeast Asian nation's economy but visitor numbers are yet to return to their pre-Covid highs.
The prime minister's office said that tourists displaying "inappropriate behaviour", including illicit drug use, will face prosecution as it "contradicts the beautiful culture of Thailand".
The pledge comes after a couple was found performing a sexual act in a tuk-tuk in a popular tourist area of the southern island of Phuket on Monday.
Authorities said they were working to revoke the visas of a 41-year-old Spanish man and a 43-year-old Peruvian woman, deport and blacklist them.
The pair admitted to the act and were charged under public indecency laws, the government statement said.
Public nudity and sexual acts in public are punishable by a fine up to 5,000 baht (€130).
The clampdown was "intended to safeguard Thailand's beautiful cultural values", according to the prime minister's office.
Checks by authorities of entertainment venues would also be stricter, it added.
Despite its reputation as a sex tourism destination, Thailand is a mostly socially conservative society where public displays of affection are frowned upon.
But the country decriminalised cannabis in 2022 and is popular among backpackers and young tourists for its rowdy beach raves.
Last month, a French couple was arrested and deported after footage of them having sex on a Phuket beach spread widely online, according to local media.
Another couple from France was blacklisted and had their visas revoked after a video of them having sex in a tuk-tuk in Phuket earlier this year triggered outrage online.
Thailand expects about 33.5 million foreign tourists this year, up from nearly 33 million in 2025 , the government has said.
Total arrivals dropped by 7% in April, compared to the same month last year, with visitors from Europe declining by nearly 16% last month, according to tourism ministry figures.
