How uncommon are female orgasms? I ask, because almost every single one of my beta readers says I have my characters, particularly the females, climax too many times/often.
Since most of us live with just one woman (at a time), it's hard to get a good figure on that. Real people average a lot less sex than formerly thought, more like weekly or twice a month, declining as they get older. The frequency of female orgasms is less, between 30%-60% of the time they have sex. Some women never have an orgasm, a fortunate few several times in a session. It depends on skill, physiology, psychology, work, children, any number of factors.
But real people aren't novel characters. Novel readers are looking for sexual performance that will titillate them and possible stimulate them to seek better from their mates. In a story, the bad lover may just climb on top and pump away until he spooges, leaving the woman bereft and pissed off. The good lover, on the other hand, puts the female's pleasure foremost and makes sure she gets hers at the same time or just before his. The contrast between the two lovers is measured partly by the number of comes the lady has, plus their quality.
One or two orgasms per encounter isn't bad performance in a novel. Three is better than average, and more than that strains credibility, even though many of the women in this very forum report having bucketloads of orgasms during each session. In other words, keep in mind the variety of readers. A woman who never comes will scratch her head over a novel where the heroine comes six or eight times a session.
In novels, too, women are forever coming from penetrative intercourse, even though in the real world, about 25% of woman can make this happen, and not always. But again, you're creating an illusion, not reporting real life.
By the way, the stats in this post come from a recent survey on sex performance over the past few years. I wish I had the source close at hand, so I'm working from memory.