text: whats the regular size for a male penis at 18?   percent length  0.2 percent  3.75 inches   0.3 percent  4 inches   0.2 percent  4.25 inches   1.7 percent  4.5 inches   0.8 percent  4.75 inches   4.2 percent  5 inches   4.4 percent  5.25 inches   10.7 percent  5.5 inches    percent length  8 percent  5.75 inches   23.9 percent  6 inches   8.8 percent  6.25 inches   14.3 percent  6.5 inches   5.7 percent  6.75 inches   9.5 percent  7 inches   1.8 percent  7.25 inches   2.9 percent  7.5 inches    percent length  1 percent  7.75 inches   1 percent  8 inches   0.3 percent  8.25 inches   0.3 percent  8.5 inches   0.1 percent  8.75 inches   0.1 percent  9 inches    so the average penis size must be 6 inches