True frotting is not just rubbing two dicks together by hand; it is done by two people lying naked on top of each other and the top guy then using fucking movement to rub his cock on your body and against your cock in the process. The friction caused and the excitement of the act can make him cum.
I do both, but like you, pulling back the foreskin as far as it will go and then rubbing the glans with lubed fingers is the best feeling. It always gets the glans stiff, even if the shaft isn't fully erect. (Age)
Average size relates to some extent on ethnicity and location. However, I am getting to think that some penises are bigger than average due to very early, regular stimulation before puberty. Being born in a place where there is a hot climate may also add to this. Happy to chat about this if anyone fancies it.
I don't go along with your description table. 5ins is average.3-4.5 is small; 1-2 ins is very small and less than 1 is micro.
Above 5 and going up to 6.5 is moderately large. 7-8 is large; above 8 is large + and 10 upwards is very large.
Of course all of this can be modified according to width. I once had a friend who had a cock 5 ins long but 3 ins wide (wide not circumference). I always reckoned on that being big. At the age I was when I first saw it, I could not get my fingers closed around it.
From what I read on here, not young enough. My young friends and I did play touching our penis ends together when about six but nothing came of it. I suspect it was one of the older boys who just wanted to se what the others had got I their pants.
I used to take my gf home by train. In those days we had the old style carriages that were without corridors. So, if we were alone in the carriage, no one could see us until at least we reached the next station and they got into the same carriage.
We could then have a quick fuck between stations. Using a condom - no mess - just throw it out of the window.
If I felt like it I could also have a wank on the way back home if I was alone in the carriage.