Wikipedia says: "Lolicon (ロリコン?), also romanized as rorikon, is a Japanese portmanteau of the phrase "Lolita complex". In Japan, the term describes an attraction to young girls, or an individual with such an attraction. Outside Japan, the term is less common and most often refers to a genre of manga and anime wherein childlike female characters are depicted in an erotic manner. The phrase is a reference to Vladimir Nabokov's book, Lolita, in which a middle-aged man becomes sexually obsessed with a 12-year-old girl. The equivalent term for attraction to (or art pertaining to erotic portrayal of) young boys is shotacon.
Some critics claim that the lolicon genre contributes to actual sexual abuse of children, while others claim that there is no evidence for this, or that there is evidence to the contrary."