Pornography
Many different kinds of businesses make and sell pornography: magazines such as Playboy and Hustler, movie companies such as Vivid Video, and web sites, such as Pornhub, that make and sell porn. Since "pornography" is a word that many people consider being the name for something that is morally wrong or ugly, businesses do not say that they are in "the business of pornography," but rather in the "adult entertainment" business.