My wife learned how to use those muscles in college while having a lot sex with men other than me. Apparently, she and her roommate found an article on it and exercised to get the skills. She was the most popular fuck toy at her university until we decided she should stop dating others. Since then, only a handful of men and I have had the privilege of enjoying her magic pussy.
Some are indeed better than others, but I don't know about THAT much better. I will say - I had one girl that had a "Magical Mouth" - fuuuuck I don't know how she did it, but she gave the best blow jobs in the world. And she was sooo into it. Man I miss that
My wife has big hanging pussy lips (labia) she always told her girlfriends she had a big pussy but is actually tighter than many women I was with. And contractions could milk me dry. She had one long time FWB he often told her how tight and good her pussy was. We both laughed later wondering what pussy wouldn't be tight with a dick the size of his. I was glad to be a bit bigger than average when I had to take seconds after him.
I can't wait to partake of the magic mouth tonight..it's killing me with anticipation...I won't think straight all day.