While I don't doubt that Tiffany Thomas might've done a scene with Jordan Ash at one point for that studio, I don't believe that all the photos from that sample set are from that scene or that they feature Jordan Ash:
1. Jordan Ash's body type doesn't quite match the body type of the guy in that scene. While I don't know that much about Jordan Ash, I did look through some older photos of him from the mid-2000s and he was a bit lankier/slimmer even back in the day compared to the guy in the photos who I suspect is Rex.
2. The thighs. In many of the photos the guy with Tiffany has hairy thighs but then in one photo the guy's thighs lack body hair. For example:
You can clearly see the guy's hairy thighs above, the hair is prominent enough that it can be seen even in these rather small photos and covers his upper legs past his crotch, but then in another photo there's no sign of heavy body hair in that area:
Most tellingly, the guy's hairy thighs in most of those photos are far more consistent with Rex's body hair from his other scenes from around 2005/2006 where he had heavy body hair on his thighs and legs:
I looked through old photos of Jordan Ash from the same time period and he lacked that amount of body hair even back in the day.
3. The photo at the far right of that page is a duplicate of a photo from another gallery/set that was featured on the same page
right below the Tiffany Thomas pics. I'm referring to this one:
The fact that the photo was featured on two different galleries means that there's already an inconsistency there.
4. The lack of the prominent mole on Jordan Ash's lower neck. Now again I'm not a huge fan of Jordan Ash, but I did some searches and he didn't have a noticeable mole on that same part of his neck that the mystery guy/Rex does, just very small ones that you have to squint to even see:
So in conclusion my theory is that the hairy thigh guy with Tiffany Thomas is Rex. My theory is that she did separate scenes with Rex and Jordan Ash both set on the same sofa, but the person in charge of the site mixed up the photos. The fact that one photo was used for two separate galleries heavily suggests that there was already a lack of attention to detail by the webmaster of the site.