Dude has sex in seat on plane while girlfriend naps.

Wow, this is balls. From News.com.au:

ARMED police boarded a flight at London's Heathrow Airport and arrested a trio involved in mid-air argument over a sex act.

The incident involved a model who allegedly flew into a drunken rage on a plane after catching her boyfriend engaging in a sex act with a woman sitting next to him.

Magazine covergirl Sarah Hannon, 35, is said to have woken from a nine-hour flight onboard Kingfisher Airlines to London from the Indian city of Bangalor to find partner Daniel Melia enjoying a sexual act, The Sun reports.

A police source said Ms Hannon fell asleep after drinking with Mr Melia before and during the flight.

Mr Melia then “got on well” with Ms Irby underneath a blanket but was stopped by hostesses – at which point Sarah awoke and started screaming.