Privacy and punishment
"Look, we've got two people secluded in the restroom. Let's congratulate them when they come out," a senior flight attendant addressed the passengers in the seats. When the couple came out of the restroom, the crew applauded loudly as they opened the champagne. "On behalf of the entire crew, we would like to congratulate you on joining the Mile High Club!" - the airline staff trolled the eager travelers.
The incident was told to the Daily Mail by a former flight attendant. According to her, the girl who came out of the restroom looked embarrassed and her companion was afraid they would be reprimanded for having sex on the plane. These heroes of the flight were not punished, but not always such things end with a happy ending.
What is an adventure for a couple, is very likely to be regarded as hooliganism or violation of civil order. This can result in a substantial fine, and in some countries correctional labor or even imprisonment for up to 3 months. Having sex in front of children under the age of 16 can also be a criminal offense. How will the police know about passion on an airplane? The flight attendant has every right to report the situation to the dispatcher of the airport of arrival. And then there will be police and tedious proceedings waiting for travelers on arrival. Each airline, by the way, punishes in its own way.
Carriers of Muslim countries, for example, Fly Dubai or Qatar Airways do not forgive such antics of passengers. If caught, they will be imprisoned for up to 3 months.
Those caught having sex in a British Airways or Finnair restroom face fines or correctional labor (usually 100 hours). Passengers who are also drunk or under the influence of drugs can face up to 3 months in prison.