Best tat around the dick I ever saw was right where the pubic hair grows, directly above the shaft. When he cit the pubes short or shaved it was bold emphatic looking letters that simply said SUCK IT-
Oh, and don't get a ruler... cause its not gonna be accurate... it will just make you look like your are faking a bigger number...
Rather than a ruler- just get several lines tattooed across the top the shaft... with each one labled successively with a goal oriented prize..... ... with the top line right at the root of the cock...
New Car
Jewelry
New Shoes
Dinner & Movie
Beer and a Pizza
or perhaps...
Marry Me
Move In
love you
really like you
Like you
Good Girl