Instead of just giving you bullshit useless info like all the others here's what I say...
Do something very generic but ALSO very short. Maybe use your initials and then add the word internet or marketing. The perfect situation would be like FDK Marketing or CBF Internet if you could get the .COM
I recommend keeping using marketing or internet because you can throw up a 'non-adult' splash page site at a corresponding URL. This way you can point people to an email address or that site if you don't want them to know you're in porno.
Best of luck! While you're at it, get some phone sex numbers
Brad