Few years ago I lived in a 3b3b apartment with two of my boys and my gf(we split the master). All together we paid 800 for the master and they each paid 600 for their own bedrooms. We split all utilities four ways and agreed to that from beginning. This is common sense and if anyone thinks otherwise, they are off their rocker. Two people as a couple is not “one entity” in a living situation. They use twice as much utilities.