from what my ex gf told me, it only matters to a certain extent. what that means is that if its generally 6 inches or over then it doesnt matter, 6 inches or 8 inches doesnt make all the difference in the world. also, thickness is much more important then length. if a guy has a 6 incher but is like 7 inches in circumfrence, vs a guy with an 8 incher who is 5 inches in circumfrence, the 6 incher is better. and anyone who says they 'dont have to worry about it' on a website is lying. if you didnt worry about it then you wouldnt be in this thread to begin with. plus i depends on every girl obviously as well.