Girth

Well all I can attest to is personal experience. I have always been thick and use to be six inches but over the past few years have gained another inch and now am seven. same length and thickness
 
I was 6 and 1/2" but now I am a touch over 7" and yes like the other guys, my girth is bigger. Testicles look to have a better hang to them also.
 
I'm a proponenet of PE and have often reasoned that sex/masturbation/PE all do the same thing, expand the septum, CC and CS as well as stretching the ligaments. Everyone's growth susceptability is different of course, but the more you use it, the larger it gets.