I think its easier to gain girth if you allready have alot to start with. Such as going from 6 to 6.5 is the easiest, 5.5 to 6 next easiest, 5 to 5.5 harder, then me starting at 4.25 to whatever the very hardest. If you look at it like you are expanding area rather than circumference it is not linear at all. Say you go from 4 to 4.5 you are making a .34 sq.in. increase which is 27% bigger as where from 6.5 to 7 you are still making the same .5 in circumference gain but making a .54 sq.in. increase which is only 16% bigger area wise... So if you think about it the guy with 6.5 girth should be able to gain the same with a little more than half the effort of the smaller guy. In my case from 4.5 to 6.5 I like to think of it as not adding 44% circumference but as would require a 2.11 sq.in. increase which results in needing to make my penis 131% bigger area wise, which when you put it that way does not sound very easy. If I need to gain 131%in area to reach my goals what about someone with 6eg starting girth gains 131% thats over 9 inches in girth and im pretty sure that has never happened which makes me start to question if it even possible. I like to think of girth as 2 deminsional not just a line. Sorry if this bums some smaller guys out but its the dead honest truth unless I did the math wrong, which is quite possible. Feel free to try it out yourself.