>>79755922not if we take a little inspiration from thermal physics. We simply get a tiny robot and station it at the connecting tube. Inside the tube will be a membrane that functions as a door, which our robot can operate at will. When the robot detects cum, it opens the door and allows the semen to flow through the tube and into the vaginal cavity, from which it can eventually reach stronny's womb. However, if the robot detects any other matter (like feces in this case) then it will ensure the door remains shut, thus not interrupting the body's normal functions