"Do you think allowing someone to take naked photos of you shows trust - or stupidity?"
I guess it would depend on whom you're trusting and why you're taking the photos.
I remember years back when a friend did that "Stop the Insanity" weight loss program...he asked me to take a photo of him in the nude. Apparently that's used for self motivation or something.
I did...but of course I had absolutely no ulterior motive, and even if I did, the photo was an old Polaroid, so it's not like it would've been easy to put it online in those days anyways...but I digress: he'd known me for quite a while, trusted me, and so I didn't think that was stupid of him...although in fairness, I wasn't exactly thrilled to be taking his photo: he had a LONG way to go on his weight loss journey.
I think if you're taking nude photos of yourself for anyone but yourself, you'd best be prepared for them to be circulated amongst people whom you don't want to see them. Sorry, but in this day and age, things travel VERY fast...and that boyfriend/girlfriend or guy/girl you're wanting to impress...will likely not be so well meaning if the two of you don't stay on good terms.
So in earnest, I can appreciate people who shake their heads now, given all the examples of people who have been destroyed by nude photos or inappropriate tweets/facebook statuses, and so on, and who put the blame on the people who don't learn from the examples of others.
But it's still pretty cruel to shrug off someone's misfortune...even if at this point in time, unless they're too sheltered or have a development disability, they really should know better.