Well,... you need to earn that.
Time for an experiment..
I theorize that your balls work kind of like my nipples. I want to play around with heating and cooling those balls to see what kind of effects we can get. Warmth might make you swell a little more, but cold will make you tighter and harder. The cold will also help your balls to produce sperm and testosterone, though. -Trust me, I looked it up.
I think that you have been sufficiently warmed up, so now its time for the cold.