Brits abroad who sunbathe topless or behave indecently on their holidays have been warned they face prison, a hefty fine or a drunken injury.
Whether it is sex on the beach, 'mooning' or stripping, thousands of British tourists risk arrest by not checking local laws and customs.
Research from the Foreign and Commonwealth Office (FCO) has revealed that many travellers are woefully ignorant of the potential consequences of their antics.
Half of all women who sunbathe topless do so without first checking if it is against the law in their holiday destination.
Meanwhile, one in seven men admitted to having had sex in a public place on holiday, while one in 20 males confessed to mooning or streaking - meaning more than half a million have risked arrest and a fine.
The survey follows recent high-profile cases including a British couple jailed in Dubai for having sex on a beach and the group of 'nuns on the run' in Crete.
The fancy cross-dressers were imprisoned for two days on charges of "causing a scandal by provocative acts and misrepresenting a uniform".
The Foreign Office has released a hard-hitting commercial urging holidaymakers to check out laws and customs at its website before they travel.
Gay travellers should also be aware that homosexuality is illegal in many popular holiday destinations including Morocco and Goa, the FCO warned.
There were several incidents in Morocco last year where individuals were charged, resulting in one Briton being imprisoned for three months.
Jess Prasad, Know Before You Go Campaign Manager from the FCO, said: "Different countries have different laws and customs, and what's acceptable in Spain may not be acceptable in Greece or Turkey.
"With more people travelling outside the Eurozone this year it is ever more important that people familiarise themselves with the local laws and customs before they go."
Richard Fielder from the British Embassy in Egypt said: "It is important to recognise that even within the same country different areas often have different rules."