my roommate is "gifted" and it's hard to ignore

We moved in a little over a month ago and it didn't take long at all for me to notice he was just shockingly big downstairs. And it's not like he's always in underwear or something, it shows through most of his pants. And if there was any doubt about me being wrong, I accidentally saw him naked once very briefly and it confirmed it. I really want to be normal and mature about it, but I'm not used to that stuff at all and it's a little overwhelming. It just sucks a little because we get along great and I feel weird being friends with him while that info is taking up so much space in my brain. Thought I'd get used to it, but here we are. It's not even his fault, that's just his body, and he ended living with a girl who can't be normal about body parts being big.