Make them buy you a new couch and deduct it from your husband's inheritance. They can keep your couch as a trophy or you can burn it!

thats actually just a funny situation, but also a great way to get your husband to agree that you need new furniture. Also depending on his parents feel after getting caught by you perhaps they will help pay for it. Doing it in the living room doesn't mean they weren't a little embarrassed and want their son to know.

Sometimes you just have to bone down wherever the mood strikes. Other times you do it somewhere you're unlikely to throw your back out.