The Collaborative International Dictionary of English v.0.48:

Proxenetism \Prox`e*ne"tism\, n. [Gr. ? agent + -ism; cf. F.
   prox['e]n['e]tisme.]
   The action of a go-between or broker in negotiating immoral
   bargains between the sexes; procuring.
   [Webster 1913 Suppl.]