Well, the left hangs lower than the right and is bigger. Also, I feel more in the left than the right. When I feel the right, I just feel a ball in it. When I feel the left, I feel the ball and alot of tubes (i guess) all around it, spaced out or something. I dont know if this is normal. I remember years ago in Junior High, my right was growing, I guess because of sperm production and I was rubbing it or something and suddenly I felt a gush of rush from the right into rest of my body. The right never expanded again. I dunno which is the functioning one.