I've been going to a gym all my life with my dad who's a trainer there and my best mate and his dad go also, when we'd finished our session our dads would go take showers but me and my friend didn't because we wanted to avoid seeing our fathers naked, but over time and as we grew up we started going in there more and more, and that led to one day seeing my dad and my friends dad naked coming out the showers. The size difference was enormous my dads penis looked 3 inches and just poking out over his shrunken balls and my friends dad who was an elderly man in his mid sixties btw was swaggering around with a cock that looked nearly 8 inches flaccid it was also so heavy it was slapping against his thighs like it was the most normal thing in the world and I remember looking at them with my jaw open and a face that looked like my world had been rocked, and that's when my friends dad said to me in front of my dad and his own son who i'll add found the whole thing funny "your mother had the same reaction".