I have never seen my older brother naked in my 20+ years of existence. That makes me weird?!? Only ATRL.
I'm not saying you HAVE to. I'm just poiting this isn't something weird or a reason to sexually two brothers. And they were also on tour together for years, at some point they had to change in front of each other.
You weirdos. Brothers see each other naked. It's no big deal.
Even if they have, that's Nick's private information that he's sharing as well If Joe wants to do 420 minute rants about his own ding dong then whatever but it's not his place to share this kind of stuff about his brother