It's 2 o'clock on a Saturday afternoon at Butlin's in Skegness and I'm about to sample one of the site's famed group activities - but I'm not about to play bingo or join a round of pitch 'n' putt.

I've arranged to attend a 'pre-meet' with a group of swingers at the Jellyfish Bar. A pre-meet is swinger terminology for a public event where would-be rumpy-pumpers meet - fully clothed, obviously - before anything naughty starts.

You might be thinking that a branch of Butlin's - a brand synonymous with family friendly seaside resorts - is an unlikely place to rendezvous with some very broadminded bed-hoppers.

But the holiday camp chain's Adult Weekenders - which are 'adult' as in 'No kids allowed' - have become very adult indeed because the 'Leave the kids at home' angle means they have become a magnet for swingers.

So, here I am at Butlin's, sitting nervously, armed only with a £6.25 pint of lager and clutching a headshot of an attractive-looking couple in their 40s who have set up the meeting...

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