User blog comment:Monkey.D.Me/Let's RANT!! ლ(ಠ益ಠლ)/@comment-112.207.76.85-20130119063038/@comment-2214433-20130119210742

--Possible Spoiler - It's about the Sword Art Online novels, there's a chapter between 16 and 17 - thus 16.5 - which contains an extensive description of the main characters having sex.