'If sex is on the cards, you barely ever remember it’ (theguardian.com)

There was a partner piece about Brits living abroad that was interesting as well:

https://www.theguardian.com/lifeandstyle/2022/sep/10/british...

From the article, it looks like what they mean is "you barely ever remember it because you're drunk."

"If sex is on the cards, you barely ever remember the first night (or the second or the third), wondering how you landed in the person’s bed the next morning."