Some days ago a had an experience that really don't know how often can occur or somebody else may experience also.

Was during a Transatlantic flight in a Business Class cabin of an European Airline (prefer not to tell the airline's name). Nature calls me, then I approach the W/C (first services was over and majority was sleeping) and the door indicates "green". For my impression a young couple were inside not precisely washing their hands... that's call love at 37,000 feet