Living with a couple is rarely fun unless you happen to be a part of the couple. It's difficult to explain, but even when partnered-up roommates are perfectly nice as individuals, as a package they have a tendency to spread their couple-ness everywhere in a way that becomes annoying to other people. Also, if they're horrible to live with then you're dealing with twice the trauma.
Perhaps the crux of the issue is that other roommates are always wondering 'why don't they just live by themselves?'. This is how many felt when they saw a ridiculous advertisement for a roommate in London where a couple were trying to rent out their spare room. The issue was that they didn't want the potential roommate to live there permanently, requesting they find somewhere else to sleep for four nights a month. The price didn't make things any better, and it wasn't long before they were getting thoroughly roasted.
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