This is the problem I've been having with the cultural leftists in medicine since day 1 of medical school. I'm a doctor, and I'm not going to carry such a harsh, judgmental attitude into the exam room, but I'm not just a doctor going through life in a series of one-on-one patient encounters. I'm also a person living in a society--a society whose social pathology I would like to be kept to a minimum. Am I "ethically" bound by my MD not to act according to my convictions in my private conversations, in the voting booth, in raising my children? What cultural leftists--i.e., the type of people who refer to pornography and prostitution with the cold, clinical, morally netural term "sex work"--cannot accept is that taboos, stigma, shame, folkways, mores, all those relics of society they wanted to dispose of, believing they were fabricated out of whole cloth by a cabal of white males for the purpose of oppressing people, actually exist to keep social pathology to a minimum. Look at what's happened since we've gone soft on unwed motherhood: an explosion in bastardy. On similar grounds, I refuse to offer moral approbation of pornography and prostitution by calling them "sex work."
ETA: That said, I agree with the point others have made that there is no reason to think that a producer of pornography must, ipso facto, be experiencing depression or anxiety.