I think the reason so many folks are convinced that the photos were taken without Travis's knowledge or his consent is the same reason many refuse to believe that Travis let her come visit and had sex with her. It is a form of black and white thought- Travis (white) was too GOOD to want to have anything to do with the EVIL (black) Jodi, and therefore, he either had to have been caught unaware, or forced.
Instead, there are shades if grey (maybe even 50 of them lol). And the way I see it, they had a tumultuous relationship, and like times in the past, Travis was able to get past whatever he complained about in the May 26th text, and did go on to have and probably enjoy, sex with Jodi. I never thought of him as saintly, and I did think he used her for all she put out. They both had issues, his were typical run of the mill guy thinking with his penis type. Unfortunately, he had no idea just how out of the ordinary her issues were, and what that would cost him in the end.
I truly think this problem as seeing Travis as super-human perfect and saintly and Jodi as completely undesirable and disgusting to him and all men way, way oversimplifies the picture and is making many people try and come up with outlandish theories to explain the circumstances that seem rather straight forward to me.