Not all men attach their self-confidence to the size of their penis. If they did, TP would have like 3 billion members. :)
I don’t buy this notion that, as a rule, bigger guys get around more. First of all, not all big guys are attractive, intelligent, or smooth. Many of them must surely be awkward, over or underweight, have bad teeth, poor social skills, are butt ugly, etc. Second, they might not even know how relatively big it is. Third (and most importantly), most women don't give a shit!
There are a lot of cocky, confident, funny, smart, attractive guys out there getting laid on the regular. To assume that all those guys are getting laid because they have a bigger than average unit is absurd—simple logic dictates that most of them must be of average size, because most guys are of average size. That means: most wealthy guys are average; most extremely handsome men are average; most pro athletes are average; most rock stars are average; and most movie stars are average. In addition, most of the guys who are none of the above but who still get around (due to being moderately good looking, charming, witty, smart, cool, funny, cocky or what have you), are also average.
So sure, there are some guys with big dicks who get around more than the average dude—some probably waaay more, but I am convinced that most guys who get around way more than the average dude do not necessarily have big dicks.