Couples pay £200 for the four-day frolic, which includes an adult bouncy castle, wet t-shirt contests and a mobile dungeon.
A beach party was scheduled for today, following a meet-and-greet held yesterday.
Guests can also indulge in hot tubs and fetish demos, enjoy the talents of a naked singer and take part in a competition to be crowned Miss or Mr Swingathon.
And after all that excitement visitors can sleep in a luxury yurt, which accommodates four people.
Other activities at the adult-only campsite include face painting, burlesque, cigar bars and a Linkin Park tribute band.
Organisers had claimed the event – which also features a BDSM demo, sweet bar, outdoor cinema, clay pigeon shooting and a mobile dungeon – was cancelled earlier this week.
Guests must take a lateral flow test 48 hours before arriving at the event, hidden in fields off the A52.
An update on the website said the ticketed event will be ‘following Covid guidelines set out by environmental health’.
An unnamed guest claimed the event is being heavily patrolled.
He suggested there is a lack of toilets and washing facilities and limited social distancing.
But he added: ‘Everyone was asked to take a test so that doesn’t worry me.
‘It’s all pretty well spaced out.’
Government guidance says only 30 guests are permitted to attend significant events, such as weddings and funerals in England.
A spokesperson for North Kesteven District Council said: ‘A licence application was correctly issued, for a bar and regulated entertainment up to 11pm in association with what was described as ‘private camping for a private camping club’.
‘So long as the event is conducted within the restrictions of the Temporary Event Notice in place, and in a lawful manner, there is nothing more for the Council to do in respect of this event.
‘Ultimately the event organiser is responsible for ensuring the event is compliant and runs safely.’
The festival is only open to people who have three personal verifications on their Fabswingers profile.
The site claims it is used by 200,000 people daily and uses a verification system to find ‘genuine’ swingers.
Ticketholders were only given the location after booking – and can only leave in an emergency.
A man who answered the phone on the number connected to the event website said on Friday: ‘I don’t have to tell you anything.’
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