Jessie figures out that the sex toy market is both a) yet unexplored in Eorzea b) very profitable, so she puts her talents to use and builds some.

And then she tests them! Either by herself or with the help of some fellow Ironworks engineers (preferably Lilja or Nero. Or whoever you want, not picky!) Or maybe Rowena accepts to sell them via the House of Splendors, but only after Jessie has given her a thorough demonstration of the toys’ capabilities!