They don't seem clear which are provider
ads versus which are mere hook-up
opportunities.  (Unless one of the
agencies is skimming all the
cream-skimmers?).
  Not that a hook-up is bad, but I
always remember . . . Charlie Sheen
said it, you're paying them
to LEAVE !

Just go to "Erotic Services".  You can't miss.  Also, this has been discussed ad nauseum on Utopia Guide.

I've had a pretty good experience in general dealing with Craig's List, but I should warn you:  I've also gotten some weird and even disturbing responses to ads, too.  A certain amount of respondents basically ignorned what I was asking for.  And I think at least one was a TS, if I'm any judge of photos.  But I've also received anonymous threats and non sequitur responses which have freaked me out a little.  Use caution.

I met a married woman once..Had some fun for a short time.
You have to be careful though, and really screen them.