
A domestic dispute out in the hallway, just where you want it to be /s.
Keeping a DD in the room and keeping the partners separate is better for both parties and for your cleaners having to clean up blood.
You can charge the guest for repairs on the door if they break it. The moisture buildup is minimal if there is a central duct with a larger fan pulling air out of the bathrooms at a minimum at all times.


The best three things we can do in space are:
Space elevator to get things up into space with less resources than all the fuel we currently use. Just need to work out a super strong material to make the cable out of.
Solar power stations that send it down wirelessly to earth, they can get power without all the annoying atmosphere in the way, just need to work out how to transmit power wirelessly and safely.
A way of collecting all the debris we continue to leave floating around in space and the upper atmosphere that will eventually make it harder to have things not get hit with high speed debris.