Intriguing conjectures about Why do human testicles hang like that? at
http://www.scientificamerican.com/blog/post.cfm?id=why-do-human-testicles-hang-like-th-2009-11-19

However, I seem to recall an article vintage ca 1970 which relates the asymmetry of testicular hang to handedness — right-handed males will have the right testis higher than the left and left-handed males will have the left testis higher. This has to do with greater muscular tone on the side with dominance (and, as such, the explanation conflicts with the opinion expressed in this article).

That must be wonderful; I have no idea what it means.
— Molière