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Male penis size girth

I have some concern about the male penis size girth of my penis when erected, It measures 115mm (4.5″) circumference along the penis shaft, and the width slightly larger around the penis head glans at 126mm (5″), the reason I ask is that when I use condoms they only seem to fit my penis firmly around the glans, and feel less secure down the length of my penis shaft.

I am worried that if I have penetrative sexual intercourse that the condoms may slip off the penis end, which could be very dangerous and embarrassing. Because of this worry about the male penis width I avoid what I want most, and that is relationships with the opposite sex.

While searching the internet I found some information published by Dr. John Dean in England, stating an extract from a journal of urology stating guidelines for augmentation based on male bigger penis size length only, but as much as I have tried I have been unable to find guidelines for augmentation for penis diameter size.

Basically I would like to know whether my penis width size is normal or not. And does size matter to girl?
Thanks for any info on this problem

Karun j answered