Most of the time, it just depends on whether I actually a.) Have time to discuss it, or b.) care to get into an involved discussion over it.

If I don't want to get into it at the time, I give the standard - "I'm an Accounts Manager for website that deals with internet marketing"

When I have time/care to explain it, I get to drop the bomb and watch the straight boys get jealous, and the girls blush and giggle. The gay boys generally want to get in on it.

I've coined the phrase, "I don't make porn - I sell it. I'm just a porn-peddler, really," generally used in response to someone asking if I'm talent.