These people have it down. Not only are they using a piece of furniture which is perfect for filming their fucking, they're maximizing the potential of that furniture; switching up positions, of course, but also utilizing the bendiness of the chair itself.
Rather than seeing the location of your sex life as just a flat surface (or a bumpy surface, or an angled surface), why not think of ways to really engage it? Use those angles! Build some momentum! It's all about interactivity, folks.
· Office Chair Ride (pornhub.com)