At last, some straight talk from Craigslist CEO Jim Buckmaster on his site's role in the "erotic services" business:

Unlike the typical Internet site, just about every function on Craigslist, if you're successful in your transaction, is going to involve you meeting the other person in person; whether it's for a job interview, or to look at an apartment, or to buy a used sofa or to go out on a date.
[Marketplace]