The Suzanne Jenkins study you linked to OLKN was written as a PhD thesis. Suzanne Jenkins now seems to be a Policy Officer at Staffordshire County Council. She doesn't seem to have published anything else on this topic, that I can find on the internet.
This article in the New Statesman questioned Brooke Magnanti's reliance on the study:
www.newstatesman.com/blogs/helen-lewis/2012/04/how-belle-de-jour-got-her-figures-wrong
Interestingly, Ms Jenkins seems to have commented BTL on that article:
"Just for clarity, as author of the study under discussion, I certainly don't claim my sample to be representative of the population, the sex-working population, or even escorts advertising on the internet. I would add that although I aimed to study 'escorts, many men, and women, work in more than one way/place simultaneously. e.g., many escorts work some of their week in a parlour, many started as street walkers or parlour workers before going independent. I personally interviewed over 100 sex workers and their experiences were wide-ranging - but that doesn?t mean others didn?t experienced sex work differently. Also, the question about plans to leave escort work were one of large bank of questions, and respondents were able to add explanatory data to their response, so some clarification of their meanings were elicited. Having said all that, my intention is not to promote sex work or to condemn it ? it more about how the law infantilises and pathologises women and how in the name of protecting women it can place them in a more vulnerable position."
This is the only public statement I can find from Ms Jenkins.
Her belief that the law infantilises women is a subjective, political belief. She states herself that she does not believe her sample to be representative. I don't see that her paper adds anything of value to the discussion.