In a video posted on Kourtney Kardashian’s website and app, the reality star challenged sister her Khloé Kardashian to a fun game of ‘Know Thy Sister’ to find out which of them knows the other one better.

Khloe revealed in the video that she was only 15 years old when she lost her virginity.

‘I think it was 15?’ Kourtney asked her, as the two played a game called Know Thy Sister

Khloe confirmed the age, revealing she had written it on her whiteboard, but not giving any further information.

The two then revealed that Kourtney’s first kiss didn’t happen until she was a little older.

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Asked by Khloe if she was in 5th grade – at around ten-years-old – the mother-of-three replied with mock horror: ‘What? Who do you think I am?’

When Khloe asked her ‘8th’ it then emerged she wasn’t exactly sure of her age.

‘I dunno,’ said Kourtney. ‘I remember it being a late first kiss. But I made up for it by doing more than just kissing.’

The questioning had begun on a rather more innocent note, as the two were first asked their favorite colour.

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