All this talk about length and girth...
The attached chart, based on various penis size studies, shows penis volume (assuming the penis to be a cylinder) by various lengths and girths. It shows, clearly, that an increase in girth drives volume much more significantly than a similar increase in length.
Not sure what it means, except volume tends to fill you up, but it is interesting. Seems to indicate that girth really counts (if used properly of course).
Me? I'm a right on average 6" length X a bit above average 5.5" girth for a very useful volume of 14.44 cubic inches.