We think of the city as a place where anything goes. Take the sensational fantasies and lurid antics of single women on Sex in the City or young men on Queer as Folk, and you might imagine the city as some kind of sexual playground--a place where you can have any kind of sex you want, with whomever you like, anytime or anywhere you choose. But in The Sexual Organization of the City, Edward Laumann and company argue that...