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A study has shed light on the worst thing men can do in bed – and women are united in hating this unattractive habit.

This new report, titled “Do Women’s Orgasms Function as a Masculinity Achievement?,” reveals everything you’ve always wanted to know about the big O.

The paper explores how manly blokes feel after taking their partners all the way, and reveals how men can hijack a woman’s big moment to inflate their own ego.

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According the Journal of Sex Research paper, plenty of men base their own masculinity on how good they are in bed.

And, unsurprisingly, it turns out that men can really ruin things by boasting about their own performance and making a woman’s orgasm all about them.

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The study asked 810 men to discuss their sexual habits, and rate how masculine they feel after their woman goes all the way.

And it emerged that fellas who are concerned about their own masculinity are more likely to base their self-worth on their performance in the bedroom.

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The trouble is that the ego boost men feel after doing a good job is likely to just put women off, since bedroom boasting is hardly a turn on for most women.

Click for more from The Sun.