Net-girl
A net-girl was the term used to describe a woman who sold access to her mind for money via the use of a permanently-implanted dataport. The practice was akin to prostitution, indeed the practice is implied to be sexual. But, there was no physical contact between the buyer and seller. Net-girls were known to exist on the non-Federation world of Finnea Prime. 

The Idanian operative "Arissa" became a net-girl on Finnea when she infiltrated the Orion Syndicate. ()

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Illegal occupations