What if evolution made the average penis 5 inches long with commensurate decreases in girth? Then all the guys with 6 inch dicks would feel good knowing that 6 is just above average. The guys with 5 inches would consider themselves average - unlike such men in the real world. Anybody below 5 would think they are too small anyway. Anybody with 7 inches would be considered really big, and 8 would be huge. 9 or 10 inches would be exceedingly rare. However, all those penises could still fulfill their primary purpose of reproduction and urination. Now let's turn the stats around. What if evolution made the average penis 7 inches along with a comparable increases in girth? Then all the guys with 6 inch dicks would think they are too small - unlike the 6 inchers in real life who just consider themselves average. The guys with 5 inches or less would consider themselves way too small. Most guys with 7 inches would want to be 8, 9, or more. 8 inches would be considered just a tad bigger than the norm - rather than a gift that 1% of men enjoy. And 9 inchers and 10 inchers would be considered large and more common place. However, all those penises could still fulfill their primary purpose of reproduction and urination. Regardless of what evolution gave us as the average size, most men will still want to be bigger than average. It's not the absolute size that matters to men, its how the relative size compared to average. For women, it is the absolute size that matters rather than relative size. If 5 inches was average, then fewer women would enjoy the feeling of being filled. On the flip side, if 7 inches was average, that would be within the ideal range for most women.