Just for the sake of argument, let's say your pics and claims are legit...
I haven't got anything extreme between my legs. about 9" length and 6" around but I like to fuck a lot and we have sex constantly.
First off, 9x6 is extreme. The false humility (or total cluelessness about what is average) is what set people off. It's extreme, accept it.
Usually it just takes a few weeks to "break-in" a new girls pussy so she's accomodated to my size and can take me pounding her very hard for an hour but this time it doesn't work.
Your experience seems a bit odd, but if that is your experience, then you've got the best solution I've come across. Not very many women can take that kind of a beating for that long. Congrats on having found at least more than one woman capable.
For the current girl, no, but you could reverse engineer your future hook ups by stating your size up front and saying you don't want to invest the time and effort in seeing if it's going to work if you already know the sex is going to be a problem down the road.
I had an ex who was a survivor of child abuse and she said early on (before we had sex) that she was going to have very strong issues about sex because of her background. I see no difference with you.
Again, this is all assuming your claims are real. If not, then I'll post this same note for the next guy claiming the same problem.