I don’t think it’s possible to convince him. In my opinion, anxiety (and perhaps bad luck) can sometimes really play with your mind. For instance, because one girl commented that one guy may have been slightly bigger than me when erect (at that time, anyway) it kinda tricked my mind. She told me I was a lot bigger flaccid and it really surprised me that he may have been bigger when erect.
I keep thinking that every 2-3” flaccid guy is going to have a 9-10” erect penis. Then there’s Mandingo. Apparently the guy has a 4.5” flaccid? This means that his flaccid is smaller than mine. Yet when erect he is 2-3” bigger than me (assuming he has a 9-10” NBPEL penis). That really can confuse guys. If a girl tells a guy that they are the smallest guy she has seen (even if she was bullshitting), that could really fuck a guy’s perspective, especially if they have anxiety issues. Sometimes to the point of being delusional. Just visit some bodybuilder forums or listen to anorexics and how they see themselves. There’s no frigging way a 7” NBPEL is small.
Of course, you may have really bad luck and come across one girl that by chance had slept with really big guys or that you’re a 6’5” muscular guy and so a 7” x 5.25” penis on them may look on the average to small side?
I don’t have a good flaccid at all, sometimes I do ( like after water pumping ). I did see a Mandigo flaccid and it was smaller than many of ours. I know that erect its a beast.
I had envisioned a Mandigo flaccid at 8” before I saw that 5” or whatever flaccid that they showed him with.