This is not validated by any research on humans. It comes from a study of cows referenced in The Clitoris, by Thomas Lowry, published in 1976.
That said, my memory is this book has better anatomy than most, and I appreciate the message. It has been a hard message for me to get across to men in my life, that’s for sure.
But I’m different. I cannot really feel cunnilingus, as the glans and distal body of my clitoris were denervated and labia minora removed. I have to use a vibrator and it’s not easy. If I decide I get to come first, sometimes that means he’s dressed, angry, and headed out the door by the time I’m finished. I might get a text or two about how sex is supposed to be a two way street.