Not business class (while the seats are very nice, the occupants don't have 2K just waiting to be spent on a quickie), and definitely not cattle class (erm, economy class/coach).
The only option is first class, which would have amazing toilets, the hottest flight attendants, and people who don't see 2K as much.
Furthermore it was probably on the A380 where they have private suites. This would make it quite easy actually. If they have $30,000 for a ticket, they sure have $2,000 cash for nookie.