This is the Report of the Committee on HIV/AIDS which documents the discussions leading up to the drafting process of ILO Recommendation No. 200 on HIV/AIDS and the world of work (you can download this document as a separate source by following this link).
Whilst sex work is not specifically mentioned within the ILO Recommendation No. 200 itself, the discussions and the agreement are on record, with the clear understanding that sex work is covered by this instrument. To get to this specific point, please see the document at paragraph 200.
You can download this 100 page document above. This resource is in English.