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The A380 may have the world’s first airborne double bed, but it won’t be put to the obvious use if Singapore Airlines has its way: “If couples used our double beds to engage in inappropriate activity, we would politely ask them to desist,” said the company’s Stephen Forshaw.

“There are things that are acceptable on an aircraft and things that aren’t, and the rules for behaviour in our double beds are the same ones that apply throughout the aircraft.”

In any case, the plane is as yet unchristened: Tony and Julie Elwood from Perth, Australia had booked the first A380 double suite, but hardly had a moment of privacy for a romantic kiss, let alone anything raunchier, as a parade of journalists came knocking on their door.

Even so, they weren’t too impressed with Singapore’s strait-laced attitude. “So they’ll sell you a double bed, and give you privacy and endless champagne — and then say you can’t do what comes naturally?” asked Tony, a vigorous 76. “Seems a bit strange.”

“They seem to have done everything they can to make it romantic, short of bringing round oysters,” said Julie, 51. “I’d say they shouldn’t really complain, should they?

"Though I don’t think they’ll have anything to worry about from us — the flight is so busy with people coming to see the suites, we wouldn’t have the opportunity.”

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