Unless he completely changes the code on the backend, the saves should transfer over. If a new save is needed, he will make that clear when the game gets updated :)
They raise the horniness level of the girls...I'm guessing the 3 you got were from the demonstration with the 2 visitors...you get 2 others earlier on in the story. Not sure when they will actually come in handy but always good to have something to look forward to.
