In the UK there are about 60million people, about half of whom are male and, of those old enough to get an erection, they have dicks varying in length from, say 4'' to 10''. A normal distribution curve shows that 0.5% should have penis lengths of about 10''. So far so good. So, about 30m. are male of whom about 70% are boys and men having full erections. ie 21million. or 21x0.5=0.105m By this reckoning there are about 100,000 boys and men with dicks over 10'' out there. Further (spurious) maths says that 30% are between 13 and 16, so 30,000 young boys must have woken up one morning with quite a surprise. More mental arithmetic concerning amount of ejaculate and distance spurted is available although the data is even more debatable!