We will go either way, but our preference is seperate. Like everyone else has already stated it is because we can focus all our attention on our play partners and vice versa. We don't mind same room, and have done so many times. We do get a bit frustrated when we meet a couple who insist on same room, and then while playing they constantly have to look at or touch their SO, keeping their attention on them instead of who they are playing with. We have found this to be more of a territorial or insecurity issue, than just being "turned on" by watching them.