In years past its been the occasional random porn star, but generally actresses from soft core cable movies or a Playboy or Penthouse Playmate ten years past her prime signing at a random booth. My camera crew bugged some annoying asian guy from "eadultcomics.com" with a few porn starlets three years or so ago (and didn't see them at another con). Nothing too risque though.

Maybe four five years ago I know a few sellers were bugged by the Con organizers for having porn there. They got really anal in checking IDs at their booths. It (porn selling and promotion) seemed to subside for a few years, but judging by the number of press releases sent out for porn stars and Comic-Con (including Jewess Joana Angel for one), there seems to be a bigger porn presence, this year at least.