Here's two observations of mine. I'm 6'1". My unit is 7.5x6. On me it looks average. On a man who as 5'8" is would look gihugeous. This must be why most porn stars, notice I stress most, are shorter than average men. Also, one other observation I read on the net and found to be true: for every twenty pounds overweight a man is he loses approximately 1/2 inch in length. I dieted down once and lost 40 pounds; I'm not sure I gained two inches but it did look much larger.