Locker room nudity in front of friend (s)?

My buddy and I (guys in our 20's) go to the same gym together regularly to workout. Sometimes we use the locker room together to change and shower. We've been doing this long enough that we don't even think about it. Somehow this came up in conversation with some girls that are in our friend group. They were a little surprised that we have seen each other naked and are comfortable with it. Is this something that is normal between friends? Is it different for girls than for guys?

Locker room nudity in front of friend (s)?
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