Yes I encounter people using my photos without permission ALL the time. Mainly models who build their own sites and think they can take all the sets I shot of them and paid them for, and use them all over their tour and I'm sure inside their site. Since I'm working on a content trade basis with a lot of girls, it's not like I can't shoot stuff of you for your site. Or if you want to use some of my photos I'm pretty reasonable-- just please ask!
Since Adam & Eve pays me outright and for all rights I don't sign a contract with them-- they own the photos and can do with them what they like. They pay me a pretty good day rate plus all expenses. Plus they let me use the photos for my website. They're a great company to work for.
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I really try to retain a respectful distance from my models, even when I'm lubing up their pussies.