There have been many studies published through the years. I site back in the Kinsey days that the very average is ... well, go download it and read it. People on this site like their big dicks. Some little ones are here but they are not really small.
One published report showed a bell curve illustrating the average of over 3,600 participants to be 4.5 to 6.25. Some married couples feel inadequate based on a guy with an average 4.5. Whereas, the vulva holds a range of size going up to about 6 inches long and six inches around.
I have found that I am unable to insert my entire penis in most women I've had.
They get hard and get either real juicy or very swollen inside and therefore tight.
The value of this is to have the rubbing of the penis to the sides of the vulva. Girls like it. This stimulation can result from a NORMAL sized penis. Abnormally large penises, as observed here on this site are not the norms. I have had ladies say they could not suck my dick because it was too fat. It is not really that fat. they had small mouths.
I knew I was above average way back before the internet. But then John Holmes entered on the seen and I was unsure. Many ladies assured me I had more than what they had seen previously.
Of the thousands of guys that have stumbled on to this site, they are most probably going to be abnormally large. Normal sized guys would not be interested in this site.
Well, except for those that like to see big ones.
Sorry that took so long to say,
6_5by 6