I have had this trouble in the past before too.. I'm not hung 25 inches but I am pretty thick around and when I ask a provider if she's okay with it and she tells me yes then it should be good to go...
When they are using their thighs to prevent me from going balls deep that's an issue because I'm not fully enjoying myself. More so I know a lot of you would just fuck her brains out but I can't get into it knowing that she is in pain and not enjoying yourself (unless its more of grudge fuck, or we are both on the same page, some like to walk like a duck the next day...)
With that said, I probably would have given her a YMMV for the masses to make their own decision but it would have been a NO for me.
EDIT: what I do like is this thread, seems like all the size queens are coming out of the closet