Mary Roach is an American author, specializing in popular science and humor.
 , she has published seven books,: "" (2003), "" (2005) (published in some markets as "Six Feet Over: Adventures in the Afterlife"), "" (2008), "" (2010), "My Planet: Finding Humor in the Oddest Places", "" (2013), and "" (2016).
Lester del Rey (June 2, 1915 – May 10, 1993) was an American science fiction author and editor.
 He was the author of many books in the juvenile Winston Science Fiction series, and the editor at Del Rey Books, the fantasy and science fiction imprint of Ballantine Books, along with his fourth wife Judy-Lynn del Rey.
Gregg Braden (born June 28, 1954) is an American author of New Age literature, who wrote about the 2012 phenomenon and became noted for his claim that the magnetic polarity of the earth was about to reverse.
 Braden argued that the change in the earth's magnetic field might have effects on human DNA He has also argued that human emotions affect DNA and that collective prayer may have healing physical effects.
 He has published many books through the Hay House publishing house.
 In 2009, his book "Fractal Time" was on the bestseller list of "The New York Times".
Stephen F. Kelly is an English author and broadcaster, born in Liverpool, England in June 1946.
 He is the author of many books, mostly on football and in particular on Liverpool Football Club.
 He has written a number of biographies of football managers including Bill Shankly, Sir Alex Ferguson, Kenny Dalglish and Gerard Houllier as well as an oral history of Liverpool Football Club.
 He was one of the first writers in Britain to explore sport through oral history, not only with The Kop but also with his oral history of Manchester United Football Club, Red Voices, and a further book on Liverpool, The Bootroom Boys.
 His other books include a novel, Mr Shankly's Photograph which tells the story of a young boy growing up in Liverpool during the 1960s with a fascination for Liverpool Football Club, the Cavern and The Beatles.
 His study of life in Britain during the 1950s, "You've never Had It So Good' was published in April 2012.
 His most recent book,'British Soldiers of the Korean War: In Their Own Words' is an oral history of the Korean War between 1950-53 and is published by the History Press.
 He was appointed Honorary Visiting Professor at the University of Chester in 2012.
Bonk: The Curious Coupling of Science and Sex is a 2008 book by Mary Roach.
 It follows the winding history of science and its exploration of human sexuality, going back as far as Aristotle and finally ending with recent discoveries about the origination and anatomy of the female orgasm.
 Throughout, Mary Roach provides a humorous and often very personal view—both as a participant and observer—of humans, scientists, animals, and sex machines.
 Of the book's numerous accounts, Roach discusses artificial insemination of sows in Denmark, the notorious history of sex machines, as well as much discussion and commentary on Kinsey's notorious attic sex experiments.
 Her footnotes provide additional humor; as in a sentence which includes several DSM diagnoses listed as acronyms she adds "And from HAFD (hyperactive acronym formation disorder)".
 In the book, Mary Roach describes a session in which she and her husband Ed volunteer to have sex while being recorded by a groundbreaking 4D ultrasound in the interests of science.
 During the experiment, a doctor looks on, making suggestions, and finally telling Ed that he "may ejaculate now."
Simon Sheppard is a writer of gay erotica and a sex-advice columnist from San Francisco.
 He is the author of many books of gay sex writing, including "Man on Man: The Best of Simon Sheppard", "Sodomy!"
, "Jockboys," "Kinkorama: Dispatches From the Front Lines of Perversion," "In Deep", and "Sex Parties 101".
 He is also the editor of "Homosex: 60 Years of Gay Erotica," winner of the 2007 Lambda Literary Award for LGBT erotica; the anthology "Leathermen"; and is the coeditor of the anthologies "Rough Stuff" and "Roughed Up."
 Sheppard's work is wide-ranging, often combining history, philosophy, and culture — high and low — with hardcore sex.
 His first book, "Hotter Than Hell and Other Stories", won the Erotic Authors Association Award for Best Collection of the Year, and the title story of "In Deep" was shortlisted for the Rauxa Prize for Erotic Fiction.
 His work has also appeared in over 300 anthologies and magazines, including many editions of "Best Gay Erotica" and "The Best American Erotica".
 He wrote the syndicated column "Sex Talk," and the online columns "Perv" and "Notes of a Cranky Old Fag."
 The online serial "The Dirty Boys' Club,” which he wrote for OutPersonals, was published as a novel in 2012.
 He also curates and co-hosts, with Carol Queen, the San Francisco performance series Perverts Put Out!
 Sheppard is openly gay, and is active in the queer artistic, political and AIDS-activist communities.
 He lives with his husband in San Francisco, where "San Francisco" magazine dubbed him “our erotica king.”
Mike Schafer (January 12, 1949 – ) is an American author.
 He has published many books, all of which are on the subject of railroading.
 He was one of several authors that helped to produce one of the definitive books on railroads in america, The Complete Book of North American Railroading
Magician is a fantasy novel by Raymond E. Feist.
 It is the first book of the Riftwar Saga and was published in 1982.
 It led to many books written by Feist in the world of Midkemia, which was the setting for this book.
 Originally reduced in size by his editors, it was re-published in 1992 (after the author's fame had grown) in an edition titled "The Author's Preferred Edition" (or "revised edition" in some markets) with much of the deleted text restored.
 "Magician" was separated into two volumes for the United States market and published as: Magician: Apprentice and Magician: Master.
 The book is still published as a single volume, titled "Magician", in the UK.
Stanisław Herman Lem (] ; 12 or 13 September 1921 – 27 March 2006) was a Polish writer of science fiction, philosophy, and satire, and a trained physician.
 Lem's books have been translated into forty-one languages and have sold over forty-five million copies.
 From the 1950s to 2000s, he published many books, both science fiction and philosophical/futurological.
 He is best known as the author of the 1961 novel "Solaris", which has been made into a feature film three times.
 In 1976, Theodore Sturgeon wrote that Lem was the most widely read science fiction writer in the world.
Li Sizhong (; 2/19 1921 – 1/11, 2009) was an ichthyologist with the Institute of Zoology (中国科学院动物研究所 ) at the Chinese Academy of Sciences.
 Throughout his research career, he made numerous discoveries of new fish species (or subspecies), and published many books and research papers describing the fauna and geographical distribution of fishes in China and beyond.
 He translated and helped publication of the Chinese editions of "Fishes of the World" (2nd edition, by Joseph S. Nelson) and "Fish Migration" (a popular science book by Russian zoologist ).
 Li was the major author of two published volumes in the Fauna Sinica monograph series, systematically reviewing and describing orders of bony fishes that include flat fish, cod, silverside, pearlfish, killifish, flying fish, etc. in or near China.
 He had written over 40 popular science articles about fish on Chinese newspapers and magazines, and been responsible for compiling and editing fish-related entries in several standard reference books (including Encyclopedia of China).

Question: Bonk: The Curious Coupling of Science and Sex is a book by an American author who has published how many books?
Answer: seven