Ronald Reagan's daughter's lesbian novel 'Till Human Voices Wake Us' is now available to buy on Amazon, where it can be downloaded for just $2.99. Patti Davis, the daughter of the conservative former President of the United States, has penned the book about a woman who falls in love with her sister-in-law.

Davis, who posed for Playboy at age 41 and appeared in the movie 'Celebrity Video Centerfold', tells the New York Post's Richard Johnson that the novel is not autobiographical. "This is not me. None of it is autobiographical," adding, "I didn't want to write 'Fifty Shades of' whatever. It's a love story." In one passage in the new book, Davis writes, "She knew my body long before she 'knew' it in the biblical sense. She stood beside me as I studied my naked self in a full-length mirror a week after giving birth to Nathan. 'Oh my God,' I moaned, lifting up the loose skin across my abdomen. 'I'm a bloodhound.'"

Davis decided to release the title as an e-book, saying she was "excited" about the new era of self-publishing. "Maybe this non-autobiographical novel was too much of a departure for publishers to wrap their heads around. Most writers have books they have laboured over for years and long to put out into the world. Till Human Voices Wake Us is one of those books," she said.

The author has long been known for her rebellious liberal streak, despite her father's Republican views. She famously fell out with her parents and did not speak to them for years.