Who'd want to take the chance and fuck her with Arthur and his wanna be tough guy lurking in the background. For all I know they're waiting for a chance to short someone's wages and then the excuse for throwing the aggrieved party out. So know, unless you want the shit, you'll stay away from it. Most likely though Rose is simply following the trend of this apartment and is lonely, just trying to fit in. Apparently she feels more comfortable with this group than she does Eric and Layla.