I'm not naked all the time, but I have no problem being naked, especially when its practical like brushing teeth after a shower or changing in the locker room. Years of boarding school drummed any speck of modesty out of me.
Interestingly, I was speaking to a guy I've known for years and years a while back. This was a person I always assumed was very modest...to the point that he was the only person I ever wore clothes into bed when we shared a room because I thought he'd wig out if I slept naked like I normally do. Our conversation turned to nudity and my pragmatism, and he said he loved being naked for the fun of it, sleeping naked, and even watching football games naked. I was floored. Its incredible how you can know someone for years and not know something like that. At any rate, you never know who around you likes getting nude.