that's called Bone Pressing man....this question has been asked numerous times i'm sure...I'm at 7 when I BP as well and my GF thought it seemed a little bigger than average before she saw it like that....like when we would make out and she would see me sticking out of my pants and feel it she said it looked longer than average
granted she was a virgin at the time and thought 7" was average....just goes to show how girls can't tell by looking