I would not be surprised if corporate big wigs (the Zaibatsu, maybe?) and corrupt politicians knew about the succubi's existence, yet totally endorse the project of sending young boys to have their literal souls sucked out just so they can have the living husks with no free will come back and work for them for cheap-if not free-labor.
Thank you for explaining the joke. I wouldn't have understood the innuendo if not for your helpful graphic.