When my wife an I got married we decided to do a relatively small wedding in order to treat ourselves for our honeymoon. We flew first class across the world. This was with an Airbus 380 by one of the bigger Mid Eastern airlines. For the ones unaware, the A380 is a double decker airplane. The top level only has business class and first class. With this particular airliner there is a bar in the middle and even a full bathroom with shower.
Leading up to the trip me and my fiancée were both fantasizing to join the mile high club. We were contemplating what the best approach would be. Because we were flying first class we had access to the spacious bathroom. Her idea was to make use of that. It seemed like the best or safest idea.
Once we were in the plane, my now wife, suggested to wait a couple of hours until we were at cruising speed and the majority would be asleep.