Hit the nail on the head with this one. I came here to say this .Colour Scientist said:Well, as you said it's about intimacy and trust.
I mean, come on, you know exactly why people send those kinds of photographs.
Anyone who sends those kinds of photos trusts that the other person won't pass them on.
People do it because it's a bit of fun, it's a turn-on for a lot of people and, as I said, they assume that it will remain private. When it comes to sex and/or relationships, people aren't notorious for their rationality.
You can call it naive and stupid and maybe it is but I'd be more inclined to blame the person who violated that trust.
Th bigger question is , why are so many people afraid to be seen naked? I mean i have tons of naked pictures of myself that i show friends . It's not like they have things people haven't seen before .
Also, OP you're old fashionned.