WIBTA for not letting guests sit on my couch.

Sounds terrible. Maybe it is. Here we go. I made the unfortunate choice to purchase a cloth sectional a couple years back that is beyond annoying to clean. It’s a two day process to unstuff, wash, dry, and restuff the cushions. It also doesn’t help that I’m annoyingly sensitive to smells like febreeze or perfumes. My nephew(20m) lives with me and his friends visit a couple times a week. They’re nice kids but live a bit of an alternative hippy lifestyle…. This includes super infrequent showers and laundry. Sometimes the body odor is.. a lot. It will linger in the room long after they leave. Now when the couch and the friends collide… it’s a nightmare. I have to wash the covers every time they sit on it otherwise it’s like rubbing my face in their armpit every time I watch tv. I spoke to my nephew and asked him to make sure they put down throw blankets before they sit and they either don’t do it or it doesn’t help.

WIBTA if I told them no more living room for them? I will add that there is a finished attic with leather couches they are more than welcome to lounge all over and watch tv up there but I think they prefer being closer to the kitchen.