I wondered that growing up. Once I started talking to my friends about masturbation, the question came up and I found out that only myself and one other friend of mine were uncut. Ever since then I wonder about it. I love being uncut and I guess I am biased, but aren't cut guys missing out??
I grew up uncut in an Eastern US city, many cut jews and middle class wasps, some uncut ethnics and immigrants. I was often alone with a foreskin, and sometimes teased. I somehow always knew that I had it better than the other guys with their scarred penises and without the foreskin that felt so nice. It must have been this knowledge that made my early sex, even with Jewish girls, so much fun as they delighted in playing with my foreskin and finding out about it. My sex with boys, all cut, was fun but I stayed away from talking about how much better mine must feel to avoid any more than normal rivalry.
These days as I go around my city, after years of discussions, gyms and saunas, orgies and nude beaches, I feel like I usually know the odds. "Whitebread American" boys and young men, 70% cut - older ones 90% cut (this is even true for 2nd generation Italian and Irish Americans); but Jewish or Moslem, virtually 100% cut; Hispanic (even 2nd generation), 80% uncut; Black, 50-50 more uncut older, Europeans, 98% uncut; South Asian non-Moslems, 99% uncut; English 80% uncut, Aussies now, 60% uncut; Africans depend on the area and religion, and Jamaicans are about 90% cut.