If you had a leash connected to a hollow plug screwed securely into a cervix, so that any tug on the leash pulled on the uterus, what would you do with your pet hole? Would you take it for a walk? Would you leave it chained up somewhere, and see how long it whines about that before being distracted by its greedy clit? You wouldn't cum right on the cervix, knowing that the plug is a hollow tube and will let your fluids pass right through, would you?