I think people tend to project their own experiences onto others, especially as this is unfortunately often considered a taboo topic still, so not everyone is happy to speak openly and therefore a lot of the time people can only go by their own experience.
I did a survey on Mumsnet a little while ago (before I was accused of depravity, and worse - of being a journo
and it got pulled) asking about women's ability to orgasm alone or with partners but without use of vibrators, and it came back that 19% of over 500 women would not reliably have an orgasm. (I guess this is different from never having one, but gives an idea of more general experience).
This was actually in-keeping with studies done...eg
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www.cbsnews.com/news/genetics-and-the-female-orgasm/
"In the study, scientists from St. Thomas' Hospital in London sent questionnaires to 4,037 women who are part of the British twin registry. About half of them were identical twins and half were non-identical twins.
One in three of the women reported never or hardly ever reaching orgasm during intercourse and 21 percent said they hardly, if ever, achieve climax during masturbation. Those figures are consistent with other surveys conducted over the last few decades.
However, the questionnaires revealed a significant genetic influence on the ability to reach orgasm, said lead researcher Tim Spector, a genetic epidemiologist at St. Thomas' Hospital.
The similarity in orgasm experience was greater in identical twins than it was in non-identical twins, Spector said. Because the only difference between the two groups was genetic, the researchers concluded that the gap between the groups was the genetic component.
After taking into account other factors that could influence orgasm, the scientists estimated that 34 percent of the difficulty women face in reaching orgasm during intercourse is due to genes.
Problems in sexual response during masturbation seemed to be more genetically influenced than orgasm ability during intercourse. The study found that 45 percent of the difficulty women have in climaxing during masturbation can be attributed to genetic makeup."
So you can see from that there does seem to be quite a bit of genetic influence in this area.
If you're enjoying yourself, having fun and your partner is considerate and attentive that is absolutely the main thing.