I haven't seen photos of myself shared (I'm pretty sure no photos exist of me that anyone would want to share), but I have found a photo I took in a torrent here. The model wasn't nude; it was a fitness shoot. The image was mixed in with a video of him from All American Guys (also not nude) and a collection of other photos from around the Internet.
I had a few mixed feelings about it. First, the version of the photo in the torrent was from Instagram and had been saved, uploaded and recompressed a couple times, and it had jpeg artifacts. The perfectionist in me was horrified that the image I spent so much time working on was being shown in a sub-standard way. I wasn't too concerned about the copyright violation since I use this site too, and that would be a bit hypocritical of me. However, I'm pretty sure the model would be uncomfortable. He knows he has a lot of gay fans and is open to being ogled, but he is straight, and having photos from fitness shoots show up on what is basically a porn site changes the context and perception of the shoot. I never told him about it, but I'm pretty sure he would have been uncomfortable with having the image in someone's spank bank. My final reaction was that the objectification of him was kind of sad. Obviously, I use porn and objectify men all the time, but it feels different when you know the person–their hopes, dreams, sense of humor ... all the things that make them more human than just a pretty face and muscular body. I kind of wish everyone who downloaded the torrent could know him as a complete person.