Former Blue Peter presenter, Janet Ellis, is in the running this year with this corker
“‘Anne,’ he says, stopping and looking down at me. I am pinned like wet washing with his peg. ‘Till now, I thought the sweetest sound I could ever hear was cows chewing grass. But this is better.’ He sways and we listen to the soft suck at the exact place we meet. Then I move and put all thoughts of livestock out of his head.”
It's not alone though and it's well worth reading the rest of the article
https://www.theguardian.com/books/2016/nov/17/bad-sex-awards-shortlist-blue-peter-janet-ellis
“‘Anne,’ he says, stopping and looking down at me. I am pinned like wet washing with his peg. ‘Till now, I thought the sweetest sound I could ever hear was cows chewing grass. But this is better.’ He sways and we listen to the soft suck at the exact place we meet. Then I move and put all thoughts of livestock out of his head.”
It's not alone though and it's well worth reading the rest of the article
https://www.theguardian.com/books/2016/nov/17/bad-sex-awards-shortlist-blue-peter-janet-ellis