I roleplay decisions so each room has a 'reason' behind who occupies it. I put all the ones with the highest Lesbian Devotion together to see if they would interact -- and with the latest public update they did. Otherwise, usually it's all with the same job together, or all Pure together, or whatever.
I also notice that in the Dorm Enya is making the moves on Amelia even though there is no option to turn on relationships in the Dorm. And the Happiness is spreading -- I had multiple people in various rooms get +49. +12, +8, and almost everyone else got +1 . . . I'm tellin' ya, they're having orgies when I ain't lookin'!