When I was asked to write a book of sex stories in which the narrators were all straight men, I faced a challenge: What was interesting about straight men? For years I'd written erotica in which the whole point was to blur the boundaries of traditional sexual identities, to take people who thought they were all one way and show how they could, given the right situation, go the other way and enjoy it. I showed straight men blowing other men, gay men getting off on women watching them masturbate, and tops opening up to being topped by somebody else for the first time. In other words, people losing their inhibitions and having new fun -- the basic currency of erotica. But what could I do with a group of straight men sitting around talking with each other about sex? (Every time I write that sentence, I start out by saying "talking about sex with each other," then have to reorder the clauses.) Men who really are straight, who won't get all hot and bothered by the storyte...