Apparently the latest big fetish thing for men is a saline injection in your testicles.

I gather it is temporary, and the fluid is gradually absorbed by the body. But I imagine it could be addictive.

Most people seem to use small amounts of fluid, but some, of course, go to extremes using many liters:

One of the things those jolly Germans love is peeing in public, either in a shop on the stock, or in a restaurant.