
Soooooo... in the interest of education and to further transparency in advertising, here is how it's done. Your vital statistics (measurements) are methods 1, 3, and 4.
http://www.wikihow.com/Take-Measurements-(For-Women)

They are probably going to instruct you on how to measure your cock, and that it doesn't start at your asshole.Well, there goes my claim to more than 4.5 inches.