Guys you are missing something . When u take a measuremets with a ruler ( the most common ones are transparent- you can see thru them ) u need to move your head a little forward because of the angle u are looking for. The head of the penis (glants) is with circle form in the top so u need to move only your head a little bit to do more accurate measuring . Thats because when u are measuring your head is standing little backwards and u are loosing 0.2-0.6 inches . Thats my opinion you can try guys , make an experiment with a desodorant , the same shape like the penis .