I have a pretty unique relationship with my girlfriend in that we are both very open and honest with each other. we have openly talked many times about previous partners, and experiences. We talked about out of all her partners who had the biggest cock. My absolute best erection measures 8x6. I came in at #2 behind a black guy she had fucked. She said he had me by about 2" but he was not very thick. Which leads me to my next point. She said that in her experience the black guy, and myself were very exceptional. She said 5" was very common. My point is that everyone seems so unrealistic when it comes to there size. Which is understandable. Based on what she said i would say that 5" is average. She said she would consider a true 6 or 7 inch cock to be big. When I look at a tape measurer, and look at where 6 and 7 inches is it definitely looks pretty long to me. I think if more guys were honest about there then guys in general would feel better about there own cock. 6-7" is big. I am basing that strictly on what my girlfriend said. So take it for what ever you want, but I think it's a pretty fair assessment.