where a boy and a boy get naked and one boy lays ontop of the other boy, they both get stiffies (hard ons, boners, erections) and one boy starts moving up and down ontop of the other boy and the other boy sucks or licks the other boys balls.
The mean distance is the same as the mean of a set of numbers,but this time, instead of them just being numbers, they're lengths. You just simply add up all the numbers and divide the total length,...