MC: Your revelations concerning Charlotte Hayes are interesting indeed. Now that I've done some Googling, I see that CH was "the most famous madam of her day" and particularly was known for her stable of "Nymphs." Here are a few links of interest:

 

Here, we see CH taking in Emily Warren, a girl not quite twelve years old, and making her part of her brothel:
http://books.google.com/books?id=v5o9AAAAIAAJ&pg=PA277&dq="charlotte+hayes"&lr=&ei=9tpXSd_YH5X8ygSWjP2IBw#PPA277,M1

 

http://books.google.com/books?id=v5o9AAAAIAAJ&pg=PA277&dq="charlotte+hayes"&lr=&ei=9tpXSd_YH5X8ygSWjP2IBw#PPA277,M1

 

And a poem:
http://books.google.com/books?id=XwwUAAAAQAAJ&pg=PA128&dq="charlotte+hayes"&lr=&ei=_t1XSaiLDYfCzgTsm9i3DQ

 

As for the source of the French text, it seem likely that it is this:
Nocturnal Revels or, The History of King's Place and other Modern Nunneries, 2 vols. London: Printed by M. Goadby, 1779.
See here:
http://books.google.com/books?id=RJNBaEYYsp8C&pg=PA186&dq="nocturnal+revels"&lr=&ei=sd5XSanWIYagyATnot3SDQ#PPA161,M1

 

and:
http://books.google.com/books?id=RJNBaEYYsp8C&pg=PA186&dq="nocturnal+revels"&lr=&ei=sd5XSanWIYagyATnot3SDQ#PPA186,M1

 

Matt Roth