I hope you're all measuring properly. Yahoo answers to the rescue:
"n order to accurately measure penis size, first you must have an erect penis (since penis size when flaccid is not an accurate measurement). How you choose to accomplish this task is up to you. But we can’t move any further in determining penis size until your penis has assumed the proper position!
Measure Penis Length -– Start off by measuring the length of your penis. All you need to do is use a ruler or measuring tape. Position the ruler or measuring tape at the base of your penis (where it attaches to your body –- make sure to press into the pubic bone as far as you can because fat can actually hide the length of your penis). Measure your penis length by marking how long it is from the base all the way to the end of the tip. Write down this number and label it “penis length”.
Measure Penis Girth -– Now you will be measuring around your penis, basically figuring out its circumference/thickness, or penis girth. For this step, you need to use a piece of string (or something similar) or a soft measuring tape. Gently wrap the string one time around the thickest part of the shaft/body of your erect penis (yes, it still needs to be erect!). Mark where the string meets and then measure the distance of the string with a ruler. You could also do the same thing with the soft measuring tape, and just mark the measurement once you reach around the penis. Write down this number and label it “penis girth”.
You can determine penis width or diameter by dividing the girth measurement by 3.14.
Great! Now you have a good idea of your penis size, and it’s time for the fun part (an erect penis is no longer needed). It is time to compare your penis size with the average penis size. Typically, the average erection has a penis length of approximately 5.5 to 6.3 inches (139.7 to 160.02 mm) and has a girth ranging between 4.5 to 5.1 inches (114.3 to 129.54 mm). The average diameter (penis width) would equal out to about 1.4 to 1.6 inches (35.56 to 40.64 mm)."