Are you a show-er or a grower?
There's no consistent relationship between the size of a flaccid penis and its full, erect length. You might think that a guy with a big penis when it's flaccid will have a gigantic penis once it's erect, but that may not be true. A penis that doesn't gain much length with an erection is known as a "show-er," and a penis that gains a lot of length with an erection is called a "grower." Most penises aren't extreme show-ers or growers.