The area seems greyer when, as happens in some operations, one person A is getting paid to have sex, and the other person B having the sex is paying person A, even if B is filming the sex and selling the video.

If they wanted to make that point, then they should have made that point instead of quoting a snippet of legislation of dubious relevance to an article that devoted more lines to chess influencers, fashion influencers, and musicians, than porn stars.