Maybe they do that military thing of hot-bunking, where they share the same bed, but not at the same time, due to a lack of space and/or beds, and leave little intimate traces of each other's presence?

Ooh, a kiss near the mouth leaving a character confused! That's perfect for you!

Damn, Bellamy! Just because there are about three hundred people in a group, you don't have to kill them! That's not a rule!

...that is not a statement I would expect to hear at a work party.