Ryanair chief Michael O'Leary said he hopes to launch an app for the airline where travellers can watch sex scenes on their iPads or smartphones while in the air.
The planned service would also allow Ryanair passengers to gamble and play games, as well as watch erotic movies.
O'Leary said, "I'm not talking about having it on screens on the back of seats for everyone to see. It would be on handheld devices. Hotels around the world have it, so why wouldn't we?"
But the move raises the prospect of passengers watching porn films with children sitting barely feet away.
Ryanair said the pornography plans would take at least a year to introduce on their flights, as establishing a cost-effective way of having a solid broadband connection on their planes would be a major obstacle.
It is not the first controversial proposal for the airline from its outspoken chief executive. Last month, he said he was looking at removing all but one toilet from his planes to put in extra seats. The plan would force 200 passengers and six crew to share bathroom facilities during a flight, leading to long queues, or worse, mid-air accidents
He had also previously proposed charging passengers for using the toilet in-flight.
However, a spokesman said, "Nothing has been decided as yet." But Bob Atkinson, of Travelsupermarket, said, "There may be a market for porn in hotels, but that's in the privacy of a room. Anyone could see it on a plane.
It's wrong."