Yeah, not sure why you don't just, as others have said, state your career/employment as "artist" or "digital creator" (for example). I certainly would NOT, if I was you, bring graphic samples of the work to the interview in any sense...some may disagree, but I certainly wouldn't want to get into a constitutional/moral argument during the interview process with a CO who may or may not be "offended" by the work, as it is just not worth the gamble. That said, if asked what type of work you do, say what you do: "artist." If asked what type of art, just be honest: "adult content for 18+" for example.
Also, you will have to discontinue your paid work until you receive your work authorization, which will give you time to study the rules/laws regarding the distribution of adult content in the United States.