It very well might be for most men. There is a connection between handness and which testicle hangs lower. For right handed men the left testicle usually hangs lower and vice versa for left handed men. Since most men are right handed, it follows that most men's left testicle hangs lower. Believe it or not, but this has been known for centuries. Put "handedness and testicles" into your favorite internet search tool and see what you come up with. Since the left testicle usually hangs lower, that one might also be more sensative.

There are, of course, exceptions to the handedness and testicle rule. I am right handed and my right testicle hangs lower.

MMHHH... LETS SEE......(SLAP)OUCH!!!! NOW THE RIGHT ONE (SLAP)OUCH!!!! NOPE, NO DIFERENCE... OMG IT REALLY WAS PAINFUL