Hermes, hey, thanks for reading and your feedback. Yes, I sense it is a large part of sexual shame and also sexual development. What I mean by development, is how far people have developed out of the "escalator relationship" model. For me, I was a kid who grew up on Disney movies and thought the model relationships was lifelong monogamy and happily ever after, until the harsh realities of life showed me otherwise. It took time for me to develop and understand that diving into a relationship in your late teens isn't how it works in the real world.
In terms of the O gap, I've done quite a lot of research on it, using large, representative, cross-cultural samples, and have concluded that it does exist, but because it's an average, there is a small number of men who drive the average number of orgasms for women down.
This is the problem with averages, and I've likened it to the rent prices in LA. Just because the "average" rent price in LA might be $4,000 doesn't mean you can't find plenty of apartments that cost $1,600 or so. There are $40,000 beachfront apartments that drive up the average in a way that makes an average essentially meaningless.
In the same way, I sense here in America, these are the Evangelicals and die-hard religious people who think that sex should be only penetrative, with very little foreplay, and male-centric.
Other articles I've written used Finnish data and data from other countries, so I sense it is a phenomenon, but one that happens thanks to a small minority of men whose wives and girlfriends never get off at all.
But I'm interested to check out any other studies you might have on it. :)