This didn't really feel like an explanation or an answer as to why you believe sex work is not "real work". What exactly are the characteristics of real work? Once you've defined those qualities it'll be easier for HN to understand why you believe it falls outside that domain.
As far as sex work being nasty and exploitative I can think of plenty of capitalistic industries that are and have been equally exploitative to their workers. (mining industry, Foxconn, etc).
As far as sex work being nasty and exploitative I can think of plenty of capitalistic industries that are and have been equally exploitative to their workers. (mining industry, Foxconn, etc).