From the BBC:

The plane has 12 private first class suites

Singapore Airlines has taken the unusual step of publicly asking passengers on its new Airbus A380 plane not to engage in any sexual activities.

The potential problem has arisen because the first class area of its giant superjumbo contains 12 private suites complete with double beds.

Singapore, which is the first airline to start flying the A380, said the suites were not sound-proofed.

It said it did not want anyone to offend other travellers or crew.