

Thank you for your perspective and experience. This is conjecture on my part, but this is likely due to the fact that the foreskin keeps a small amount of moisture around the head of the penis making insertion easier and more comfortable for both of you. And because there is more skin on the shaft that can slide up and down with the repeated in and out motion, it causes less friction that can get uncomfortable over time.
Just remember that with challenges like that, the main purpose is to guage your problem solving skills. You don’t necessarily have to complete the challenge in time, don’t necessarily have to make it work error free, etc. They want to see how you work through it all. Don’t get me wrong, if you ace the challenge, that’s great. But they mostly want to make sure you have the fundamentals and skills to comprehend the problem and work through to a solution.