Question: Why was "Looking For Alaska", the debut novel of John Micheal Green (born in 1977), challenged in 2015?
Context: John Michael Green (born August 24, 1977) is an American author, vlogger, writer, producer, actor and editor.  He won the 2006 Printz Award for his debut novel, "Looking for Alaska", and his sixth novel, "The Fault in Our Stars", debuted at number one on "The New York Times" Best Seller list in January 2012.  The 2014 film adaptation opened at number one at the box office.  In 2014, Green was included in "Time" magazine's list of The 100 Most Influential People in the World.  Another film based on a Green novel, "Paper Towns", was released on July 24, 2015. L. J. Ross (the pen name of Louise Ross) is the bestselling author of the DCI Ryan series of romantic suspense thrillers.  Her debut novel, Holy Island, was released in January 2015 and, by May, it reached number one in the Amazon UK chart.  Its sequel, Sycamore Gap, was released in September 2015 and is also a UK bestseller while the third in the series, Heavenfield, was released in March 2016.  She has subsequently released three further books in the DCI Ryan series: Angel (in August 2016), High Force (in January 2017) and Cragside (in July 2017).  As with her debut novel Holy Island, LJ Ross's most recent novel Cragside reached the number one spot on the Amazon UK chart and she is now reported to have sold over 1,000,000 copies. Green on Blue: A Novel is a 2015 work of fiction written by Elliot Ackerman.  Set in modern-day Afghanistan, it is told through the point of view of Aziz, a young boy who must join the Special Lashkar "–" a U.S. funded militia "–" in order to save his injured brother.  Dr. Truman Anderson has called "Green on Blue" a “morally complex debut novel" for how Ackerman explores the themes of loyalty to family and nation, revenge, and the brutality of war throughout the novel. Looking for Alaska is John Green's first novel, published in March 2005 by Dutton Juvenile.  It won the 2006 Michael L. Printz Award from the American Library Association, and led the association's list of most-challenged books for 2015 due to profanity and sexually explicit scenes.  The story is told through teenager Miles Halter as he enrolls at a boarding school to try to gain a deeper perspective on life, and was inspired by Green's experiences as a high school student. Angel Angel is the 1995 debut novel by American writer April Stevens.  The story, set in Connecticut, centers upon a dysfunctional suburban family whose malaise is challenged by the introduction of the older son's live-in girlfriend.  The novel, published by Viking Press, was well received. Looking on Darkness (Afrikaans: "Kennis van die aand ") is a 1973 debut novel by prominent Afrikaans novelist Andre Brink.  The novel was the first Afrikaans book to be banned by the South African government. Diane Setterfield (born 22 August 1964) is a British author whose 2006 debut novel, "The Thirteenth Tale", became a "New York Times" No. 1 best-seller.  It is written in the Gothic tradition, with echoes of "Jane Eyre" and "Wuthering Heights".  Her debut novel was turned into a television film. Brian McGilloway is an author hailing from Derry, Northern Ireland.  Born in 1974, he studied English at Queens University Belfast, where he was very active in student theatre, winning a national Irish Student Drama Association award for theatrical lighting design in 1996.  He is a former Head of English at St. Columb's College in Derry, but now teaches in Holy Cross College in Strabane.  McGilloway's debut novel was a crime thriller called "Borderlands".  "Borderlands" was shortlisted for a Crime Writers' Association Dagger award for a debut novel. Up to the Mountains and Down to the Countryside is the 2015 debut novel of Quincy Carroll.  The narrative is split between the perspectives of two Western teachers living in Ningyuan, China, a remote township in southern Hunan.  The first, Thomas Guillard, is a jaded longtime expat who arrives in Ningyuan looking for a job at the local high school just as his visa is about to expire.  The second, an idealistic young man named Daniel, who has been working in town since graduating from college, welcomes him initially, but then gradually comes to resent him over the course of the academic year, regarding him as the epitome of the pathetic, creepy laowai stereotype he has—until that point—tried his best to avoid.  One of Daniel's former students, Bella, a young girl obsessed with learning English, befriends Guillard upon his arrival and provides numerous opportunities throughout the semester, both on- and off-campus, for the two characters to come together.  In the end, however, the town and country prove to be too small for both of them. Siddharth Dhanvant Shanghvi (born 1977) is an Indian author.  His debut novel "The Last Song of Dusk" (2004) won the Betty Trask Award (UK), one of UK's most prestigious prizes for debut novels, the Premio Grinzane Cavour (Italy) for the Best Debut novel , and was nominated for the IMPAC Literary Prize (Ireland).  It was translated into 16 languages, and became an international bestseller.
Answer: profanity and sexually explicit