Singapore Airlines is not allowing romantic passengers aboard its new Airbus A380 Superjumbo jets to use the beds in the private suites of the world's biggest commercial plane for sex.

Australian newspaper Mercury quoted a spokesman of the airlines as saying that the ban on airborne sex is among the rules for passenger behavior during flights of the A380.

The spokesman, Stephen Forshaw, said couples doing the act inside the $14,320 double bed suites will be politely asked to stop their "inappropriate activity."

However, it was not clear how flight attendants will know if suite passengers are violating the rule when the door of the private cabin is closed. The penalty for such violation is also unclear.

The first couple to book one of the double suites, Tony and Julie Elwood, were not impressed by the rule, according to Gizmodo.com. The couple said the rule is a bit strange because the accommodation comes with privacy and endless champagne.