SpecSteve, with all due respect here kiddo, I don't think Susie was talking to you or about you. You stated in your post that you
"I came in to it by just seeing if I could add one more finger. The girl was usually curious too.. One time, I ran out of fingers with a woman, tried the thumb and that ended with my hand up in her.. Wasn't starting out to fist her, just happened as a matter of progression."
You said, you were not starting out to fist her, but it just happened as a MATTER OF PROGRESSION. Which means that you probably took some time prior to your hand going completely in her to stretch her out, one finger at a time and with enough lube. We under stand that fisting her wasn't your initial plan, but happened because you progressed up to that slowly.
Maybe what Susie means, and again, she probably wasn't directing her comment at you, is that a guy just can't matter of factly start fisting a girl. It is a process that takes time, it's not easy. Some of the OTHER poster made it seem like fisting just happens and happens quickly, easily, and without prep work. Again, you didn't say that, so again, I don't think Susie's comment was directed towards you.
With all that being said, and with absolutely no respect intended, guys if you find a woman that you can spread her legs open and insert a fist easily, quickly and without intent on doing so, she has problems, and you had better have a horse dick. Just sayin....
So back down killer, it's all good.
Mashie