Before the Sexual Revolution of the 1960s, there was a joke popular in New York nightclubs. What do eggs benedict and a blowjob have in common? They’re two enjoyable things you don’t get at home. Yes, kids, there was a time when oral sex was exotic, primarily the province of prostitutes and gay people. Well, times have changed. In the 1994 “Sex in America” national study, Ed Laumann and colleagues 3,432 American adults. They found that about a quarter of their sample had had oral sex in the past year. Today, depending on the study, it appears that over half…