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Who can forget the iconic diner scene from When Harry Met Sally?

We see Meg Ryan very loudly and publicly fake an orgasm to show Billy Chrystal’s clueless character how easily it is to convince a man she’s having a good time in bed.

But even though the film came out in 1989, it seems men still haven’t learned.

New research shows blokes seriously overestimate how capable they are of making their partners orgasm.

A study published in the journal of sexual medicine looked at 1,683 heterosexual newlywed couples.

Researchers surveyed husbands about how often they thought their wives climaxed and compared those results the women’s self reported orgasms.

In news that will shock very few heterosexual women, the men were way off.

A whopping 87% of husbands and reported consistently experiencing orgasm.

In contrast, just 49% of wives did.

(Image: Castle Rock entertainment)

Meanwhile, 43% of husbands misperceived how often their wives experienced orgasm.

This research correlates with what sexual researchers call the "orgasm gap".

In 2017, The Archives of Sexual Behaviour published research that showed 95% of straight men usually or always climax during sex – compared to only 65% of heterosexual women.

Author of Becoming Cliterate: Why orgasm equality matters, Dr. Laurie Mintz, explained why heterosexual women continue to come up short in the big-O department.

Talking to NBC, she said: “The number-one reason for the orgasm gap – and it’s not the only one – is our cultural ignorance to the clitoris.”

The psychology professor and human sexuality expert argues that women more often than not need direct clitoral stimulation to achieve orgasm.

Media depictions of sex rarely show this.