Well I agree with Azwildcat that some say it's not that important when it may be....
But I think Roxy nailed it when she said it's GIRTH not length that counts. It doesn't take much more than 4 inches to fully penetrate a vagina so that means that most guys are adequate in the length department. It's silly that they/we all want 10+inches when 6 are enough.
I believe that size(girth) may matter performance-wise. Having a thicker penis does 2 things to help performance. 1 - it stretches fills a woman more completely allowing for more area being stimulated and more easily creating an orgasmic plateau = she will cum faster. 2- Because of #1 ... the man will not have to thrust so much to bring the woman to orgasm which means he will last longer ....
That is my belief about size from a strictly performance standpoint. Using that variable ALONE , it does matter. But there are MANY other variables that have an effect on the whole outcome of a sexual encounter.
- Some women can't take bigger than average
- the man's attitude and character matter alot more and vice-versa for women
- comfort
- cleanliness
etc....
just my 2 cents...
mopek