Mummy porn writer EL James has threatened a housewife with legal action for throwing saucy Fifty Shades of Grey parties.
Tina Winters, 45, wanted to pass on tips and sell lingerie but lawyers told her to stop using the novel as a theme.
She said: “It’s unbelievable. This book has gone all around the world.
"Everyone has been using the book title to sell lingerie and fashion.
“Sex shop brands and department stores have all jumped on the bandwagon, yet I’m the one who gets a letter.
"I find it quite bizarre. It’s like a battle between David and Goliath.”
The bondage novel has become the UK’s bestselling book since records began.
Tina, of Coventry, must stop the parties and remove references to the British author’s book from her website.
EL James’ agent Valerie Hoskins said the legal letter was not personal, adding: “You can’t just hijack something someone else owns.”