Use the shower to let the flowing water massage your cock. Streams flowing from the top gently licking the entire length. I like to rest shower nozzle in fixed position on my stomach below the navel. Instead of swinging the shower head around, play with the water temperature, changing it slightly until the temperature is as neutral as possible for the body. The jets gently hit on cock from above in a fixed place and with constant force and over time cause a pleasurable feeling of dullness into cock.

The point is, the water works so gently that the excitement builds slowly, allowing you to get so insanely close to the edge and prolong the experience.

It takes patience, but the effect is worth the wait. It's so exciting, everything gets so tight it almost sucks your balls in. You have some time to figure out when to stop. But remember, the PONR is always closer than you think.