Seeking Some Basic Assistance

So I’m new here. Hello world. My wife and I have ramped up our playtime to include chastity and denial. So, I grasp the basics with the cage: roll him up, place him in, lock it shut. I’ve found that lotion helps reduce the pull on my scrotum, while shaving keeps the cage from pinching or pulling.

So I have a multi-stage question regarding urethra inserts. How do you keep the tube from drying out and pulling at the inside of the penis when aroused, or during removal? What is the best lube or lotion for this? And besides feeling amazing, is there any real benefit to using them? Smokeymountaincuck