It doesn't seem you're getting much response to your actual question. I did a search on "penis size" and came up with these threads here:
What Does "Well Hung" Mean? How do you measure your penis and how long is it by that method? http://honeymoons.about.com/gi/dynam...com%2Fpenis%2F
Now I know I'm in a rarefied atmosphere as far as experience goes here. We're not swinging yet. But what folks are telling you makes sense as far as its importance. The dick is just one member (so to speak) of the sexual "team" that goes together for a pleasurable experience. I can say of the dozen or so girlfriends I had before getting married, all of them remarked at one point or another how "endowed" I was in a positive fashion. And I'm a "measly" 5 1/2 inches erect - low average by most medical surveys, and probably "small" by a lot of participants here. Maybe this is a female standard boilerplate remark to boost men's egos, but they sure seemed sincere to me at the time.
Anyway, what I have seems to work just fine with the exception of a few sexual positions where a bit longer would be helpful.