Just wondering if this is true: Hi I'm 19 (a little old i know) and me and my gf were getting "into it" one day and she stopped and said something like 'omg (name) you're not finished growing' when I asked her why she thought that she said that I had some sort of "wrinkle" marks on my dick, kinda like it still needs to be stretched out more, only I was fully hard.
I'm 6" ok and circumsized and my skin on my dick doesn't appear really stretched or tight and it does have those wrinkle "rings" (it's got some stretching room), but she said that means that I'm not finished growing down there, by the looks of it maybe another inch. She does have her girlfriends so, when I told her that story was a load, she told me her proof which consisted of stories about her girlfriends' boyfriends that I really didn't want to hear (if you know what I mean).
Is this just a myth/story or something, or is it true, i'd never heard it before and I thought I knew everything about myself anyways.