I have always liked being naked and am not concerned at all about others seeing me. I have ridden in the Naked Bike Rides, the last one here having over 10,000 people in it, so I sincerely how that I am not bothered. lol.
A lot of guys will say they're okay with others seeing them naked (not surprised at the results). I bet most of them are trying to appear confident and proud though. I feel pretty comfortable with my body but I really don't want to be naked with people in general. I'm pretty fit and toned. Being naked around others wouldn't be a big deal for me, but that's not the culture I'm familiar with and would rather not.
When I'm doing well... yeah, I rather like being naked. Depending on the time period. Like, January/february, I worked 64 hours a week and totally slacked off on the gym, so I felt awful. I'm getting back in better shape March/April, so I'd be comfy nude again.