There's nothing whatsoever wrong with nudity and it should never be a matter of shame for people, but like all things there's a time and a place for it. I don't think anyone would consider it OK to go to a funeral in your birthday suit [img]tongue.gif[/img] or go to the first meeting with your future parents-in-law with literally "nothing to wear"
I don't think nudism promotes lewd behaviour though - if anything, it gets people used to seeing nakedness, and will therefore decrease the sexual connotations it has. What cannot be seen is often more alluring than what can be.
On the topic of nudist parents and their children - that's a bit more difficult. Nudism should be a choice, not an obligation, so I think if teens are uncomfortable going on nudist holidays with their parents, they shouldn't have to. Not sure at what age children should be able to decide that though - young children don't feel self-concious and there's no taboo on their nudity (at least not where I live - it's normal to see toddlers on the beach naked).