This video actually appears to be incorrect in that it states the flow of semen is interrupted. This is untrue, as this device blocks only the sperm cells:
That just can't be healthy. It's one thing to get our tubes tied, wherein you still produce semen but not sperm, but this is literally prohibiting something from leaving your body that is supposed to. Can you imagine if someone didn't like to poop, and installed something like this in their rectum? The reason we call them natural functions is because they're just that: natural. This is an ew.