Looking at the cover and knowing nothing else about author, genre, etc:
People decide to hold a death race near a dinosaur loudly and repeatedly orgasming while having sex with either a Lovecraftian beast, or an Octopus. I mean, it could just be an octopus.
Car racers die from the road itself, the cars themselves, each other, and random unrelated actions of sex (Dino and octopus humping and not paying attention to where they fling their limbs). Or they just choke to death while driving and sucking in the polluted fire ash filled air. The winner of the race receives: a jar of Canadian maple syrup.