Similar to any other parts of the body, one hand, foot, pectoral muscle, or breast is usually slightly larger than the other. Some people need to buy a larger shoe or bra size to accommodate their larger-sized body part. Often, but not always, the left testicle is a bit larger and a bit lower inside the scrotum.
As most people tend to use their strong side more often (left handed - left arm, shoulder, etc.; right handed - right side), the muscle mass on that side increases causing a disparity in size.
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