There is a belief that sex work is not a dignified way to make a living.
We see anti-sex work activists and abolitionists try to fool people into sustaining this belief: you cannot have dignity if you choose this; you are sullied and less than by this work you do. (Many continue into dogma about it being inherently exploitative and violent.)
Obviously, this can only be the case if sex, or eroticism in general, is thought to be something dirty and shameful, and thus the choosing it as one’s work makes you dirty and shameful.
Why is sex not dignified? Who got to decide that the emotions, arousal, and mechanism by which we came into existence is perhaps not the most dignified thing of all?