What was your reaction when you found out? Has your perception of him changed? What if you were the male friend in question? Have the relationship dynamics altered?
I wrote about this in another thread before.
I'd thought about my friend's dick for a while and, while I'd seen it at a glance when it was really soft, it was only when I went skinny dipping with him in a hot tub that I realized he was pretty hung. Since that moment – in the last year – I've skinny dipped with him and seen him on a couple dozen occasions.
My reaction was (and still is) excitement. Honestly, when I see his dick (at varying degrees of erectness), blood rushes to my dick and I try not to be too obvious about how horny I am. Seeing his big dick and seeing each other naked overall has just brought us closer together, and we're much more comfortable and open with one another as time goes along. If anything, because his dick and mine are around the same size, I don't find that there's any awkwardness and, as we talk more and more about our horniness, I'm curious to see where things go.