Is it unreasonable to ask my roommate's girlfriend to chip in for rent?

I live in a 2 bedroom 2 bath apartment with 3 other roommates. One of my roommates has a girlfriend over every single weekend, she comes Friday night and doesn't leave till around 1am on Sundays. For most of the weekend, they spend their time spooning/making out on the living room couch while watching TV. I wouldn't mind if this was occasional, but she's here every single Friday like clockwork, usually trumpeting her arrival with her signature high pitched squeal. It's gotten to the point where one of the roommates just leaves for the weekend because he gets iled so much. My roommates and I are fed up, and we're wondering if it's appropriate to ask for compensation.