A person who is any sexual orientation but loves their couch most.
A person who likes to sit on, lay on and / or caress the fabric of their couches for sexual pleasure.
Person 1: So you lied to sit on your couch
Person 2: No, I like to “sit” ;) on my couch, I’m couchsexual!
Someone who is sexually attracted to couches and likes to fuck the couchussy.
Person 1: "Did you hear Oskar is couchsexal?"
Person 2: "What's couchsexual?"
Person 1: "Someone who likes to fuck couches in between the cushions"