I saw this appropriately sweet spillway at Dulce Lake, New Mexico and loved the tunnel effect with the washout light at the end of the tunnel. I knew I had to do some kind of sci-fi effect with it. The Time Travel prompt made me think Quantum Leap!
Is the nudity necessary? Yes. In the Terminator movies, they always teleport in naked. Is there a good reason for that? Not really. So do I need a good reason to flop my dick around in this? Not really.