From a relationship standpoint, it is a matter of trust that if you share intimate photos with your partner, that person isn't going to share them without consent. It's also a matter of control.
As for me personally, a quick Google search will reveal at least one photo shoot of me in just underwear. Why? Well, it's part of my job (no, I'm not a porn star, sorry to disappoint, kids), as an actor and model. I'm perfectly fine sharing these photos, as they were made for art and "for the public's eyes". I have control over what I'm doing in the shoot, and to what audience the photos are directed towards.
That being said, I can't say I would be too happy with intimate photos of me in a more... ahem ...personal setting were on the web. The audience was for one person, and now the audience is millions. Big difference in those two scenarios.
Capchta: where can you remember the summer adventures?
Well, wouldn't you like to know.