Literature says that the left testicle hangs lower than the right in most right handed men and it is the right testicle that hangs lower in most left handed guys. That is why the left usually hangs lower because most people are right handed.
Hahaha... I actually knew that too. The guy who fixed my varicocele told me. BTW, I think 80% or something of all varicocele cases are in the left nut. Forgot why but it's something with the anatomy of the veins in the lower abdomen. The blood has to do an extra curve to reach the left nut or something like that.