I can’t understand how my girlfriend’s Vagina works

I have been dating “K” for a little more than a year and a half. I have had my fair share of experience with previous partners, but never have I ever seen anything close to her. For starters, she can climax incredibly easily, she basically turns herself on at will. If she decides she wants to orgasm, 30 seconds is all it takes. The stimulation doesn’t even need to be strong or in a certain way. Of course, such quick orgasms aren’t particularly pleasurable for her, but still the fact she can do it boggles my mind.

Then again, K seems to be able to decide the amount and intensity of her orgasms. Sometimes the same stimulation will lead to many, less intense but quicker repeated orgasms and other times she will only have one or two extremely strong ones that take more time to achieve. I don’t know how to explain or describe it but it is as if she decides how much she wants to “charge” each climax and then just willingly releases it into an orgasm. She says both scenarios are equally pleasurable but in different ways.

Now all these in themselves would be kinda extraordinary, but not crazy. She is in tune with her s*xuality and body, I get that. The part that baffles me is that she can also withhold orgasms at will no matter the type of stimulation. It has kinda turned into a game by now, where I try to make her cum while she tries not to finish. Time and again I “lose” no matter the type and intensity of the stimulation, fingering, PIV, toys, eating her out, nothing works. Then I quit trying and a minute later she is cumming.

So to sum up, my question is, how is it possible for somebody to have that much conscious control over something like this? The answer she comes up with is, she just goes with what feels good at the moment, but that doesn’t make much sense. I get the impression she doesn’t want to answer the question for some reason. One thought that has crossed my mind is that she can’t climax at all and has been faking it all along, but she seems to be having way too much fun, genuine fun to be faking for so long.