This entire couchfucker talk reminds me again how weird it is that cishet dudes have exactly one allowed way of masturbating. Getting off inside a piece of furniture is probably the least objectionable thing this dingus ever did, it's like the Liz Truss day collar discourse all over again. Let's not even get me started on how people in politics are the absolutely last group whose sex life i want to hear about.
I would say to look up muffing, but maybe "look up" might be inadvisable. Anyway it's a non-anal way penis-havers can experience penetration. (sorry if too horny for Hexbear)
I know a guy who really fucked a couch. He stopped because his stepdad found out and explained to him that something terrible would happen if he kept doing it.
Anyway, he's the raddest anarchist I know and the only couch fucker I respect.
Edit: I should say, he's the couch fucker I respect the most.
I may or may not have seen a number of porn vids online of guys screwing a fleshlight or object wedged between couch cushions or mattresses or pillows in my travels.
I've heard (and definitely never tried this as a horny teenager left alone for the weekend) that you put a ziplock full of lotion/lube of choice between the cushions and use it as an improvised masturbation aid. I've also heard that it's more work than it's worth and much better results can be found using a couple of sponges, a few rubber bands, and the aforementioned lube filled ziploc