There are stiffies and then there are stiffies
Why is it so, er, hard? It certainly seems simple enough: get a stiffy - whip out ruler. Ah, but as any man can tell you. There are stiffies and then there are stiffies. The difference between a half-assed erection and a raging hard-on can be as much as an inch. Then there’s the methodology. Where do you measure from? Along the top? Along the side? From the bottom? Each method gives a different result.