I have used cock rings
a) Penis Enlargement - now an integral part of my Penis Enlargement Regime - after my morning session, I keep a Cock ring on for most of the day until my evening session - my cock stays thicker, balls hang lower - one member has posted that their cock grew in length by 1 cm over 6 months just through the cock ring
b) Sex - feels much better with the ring on, helps with controlling orgasm, and the actual orgasm feels much better
There is a huge variety of rings, including those which also have a separate ring for the balls, and stimulate the area between the scrotum and asshole. I have more than a dozen of them and really recommend them