Put some thought into what makes a really bad sex scene. Don’t make it too unbelievable, something no one would ever have written, but how bad can you go?
Twisted arms and legs, body parts which move in odd ways or seem to multiply? Words that don’t suit the mood, aggravate the mood or completely bypass the mood and make you want to read something with fluffy bunnies instead?
Write about sex in a bad, messed up way. Play with it.
Idea source: Bad Sex in Fiction Award 2015: What are they and does Morrissey have a shot? | News | Culture | The Independent
His knuckle rubbed her pussy button, giving her a hard on. Once she was really wet, dripping like a leaky faucet, he dived into her crotch shoving deep, mining her with his throbbing, purple pussy eater.
It doesn’t need to be long. In cases like this, short is a good thing. It is fun to write, without the pressure of trying to make it good.