I like to show off my cock (and the occasional compliment I receive makes me more confident about its small size), I'm curious to see others cocks (we all like to see how we measure up to the next guy) and it's great to chat about what we enjoy doing with our hard cocks.
I was brought up to think that it was natural to be seen naked or see other naked in an appropriate situation, ie locker room or showers at school or sports club, so I am very accustomed to being naked in company...and in saunas in Germany and Scandinavia nudity is compulsory (for hygiene reasons-- clothing is dirty!) and men and women mix without any problems...and one sees all sizes and shapes!
I prefer going commando if I can (I did so for a couple of years fulltime...now only evenings and weekends). If I wear underwear, tanga briefs are the most comfortable- max suppprt with min coverage and they don;'t ride up my backside; for gym and sports a jockstrap keeps everything snug...I don't like my tackle bouncing around then.