I am 55 years old now, and all my live I thought size matters a lot.
Because my penis is about 1 inch when soft and maybe 5.5 inches hard, I felt ashamed and never dared to be seen naked.
When I divorced a coupe of months ago, I started exploring nudism by going to a smaal nudist beach. At first I felt really uncomfortable, laying on my back with my small penis. Walking to the water felt terrible, coming out was even worse because it shrunk even more.
After a while, I noticed that some men had way bigger penisses, but nobody seemed to care. Not about their good looking penis and also not about my small one. It made me feel a bit more confident.
Somewhere around my 4th visit there, it was a bit crowded. We were laying side-by-side with less than a meter between each other. It was funny because I noticed we were male/female/male/female/male/female/male/female in a row. But maybe even more fun was my discovery that I forgot that I was naked. I felt normal between all those naked people.
So that's about penis size and being seen.
About penis size and intercourse. I occasionally have sex with a female friend. We are experimenting and discovering.
Perhaps the most interesting was to find out that my 5.5 inch shouldn't be more for her, because then it would either discomfort her, or I had to be careful not to go to deep.
And, while experimenting, we found a very pleasant spot for her, her g-spot. She has a sensitive g-spot and I only need maybe 2 inches and a good "angle" (my penis is curved up, so it's perfect to reach the g-spot). Rubbing my glans on her g-spot with only 2 inches inside is perhaps the greatest way for her to get to her orgasm. Then going deeper only during her orgasm to extend the feeling is enough. And then again my 5.5 inches is perfect.
And even only going for her clitoris can get her into an orgasm, so only 1 inch. ;)
So, bottom line, on a nudist beach, size doesn't matter at all, and the first few inches inside a woman is the best place to pleasure her.
It's not about quantity, but about quality.