Despite what the trashy magazines and films might tell you, the vast majority of women can’t orgasm through penetrative sex. Usually, that’s put down to psychology, penis size, and the ever-elusive “G-spot.” But according to a recent study in Clinical Anatomy, the shape of the female anatomy is what makes the difference.

The study found that women with a clitoris 2.5 centimeters (1 inch) or less from their urinary tract will be able to reach a climax through penetrative sex. Any more than 3 centimeters (1.2 inches) away and it’s unlikely they will be able to orgasm through penetrative sex.

The study contends that women who have a small space between the clitoris and their urinary tract find it easier to orgasm as they receive more friction and stimulation on and around their clitoris.

Speaking to Medical Xpress, Elisabeth Lloyd, an expert in reproduction and sex at Indiana University-Bloomington who wasn’t involved in the study, said that it’s still possible for all women to have an enjoyable sex life, regardless of these anatomical differences.

“We've learned in our research there are so many women who do not have orgasm with intercourse on a regular basis," said Lloyd. "To put this banner of healthiness as having orgasm with intercourse kind of stacks the deck against these women who, because of their anatomy, cannot have orgasm with intercourse."

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