When I was about 16 years old, I went to the beach with my girlfriend who was 15 and my best friend who was 13. A wave hit my shorts and left an imprint of my penis, my friend saw it and said "damn your penis is small". My girlfriend laughed for a second after he said that and i thought that was the end of that. Then fast forward to now, I am 21, my girlfriend is 20, and my bestfriend is 18. Me and my girlfriend are getting married this summer, and she just told me that in the past 4 years or so my best friend has been having sex with her almost daily, even if it was a quicky. She also told me that his penis is 10", which would make it literally twice as long as mine is at 5", not to mention she's telling me he's thicker than a beer can. She told me she still wants to be with me, but only if she can have sex with my friend because to quote her "his sex is superior" to mine. I dont think I can leave her, i love her too much.