The receiver should not pop off. Mart is correct, press the green button to remove air, that should make the receiver go further down on your penis. Another tip is next time you cum inside the receiver, just turn the venus off and leave yourself inside. Wait a few minutes, then turn it back on very slowly. You will definitely get hard again. After you get used to cuming 2x, following time try for 3. :). I’ve had mine a few years and I use mine 3-4 times per week on average. It never gets tired.