Missing RAF gunner Corrie McKeague 'was a member of a swingers website'
Nicola Urquhart said the young couple had a Fab Swingers account.
She spoke out on Facebook after a link to her son’s swinger’s page was posted anonymously on an internet news site.
But she insisted her son’s lifestyle had “nothing to do” with his disappearance.
After facing a torrent of abuse from trolls, she said: “To the haters, get over it. This is none of your business.”
Mr McKeague's girlfriend, who is pregnant, had shared the swingers account with him
To the haters, get over it. This is none of your business
Mr McKeague, 23, from Fife, vanished in September after a night out with friends in Bury St Edmunds, Suffolk, near his base at RAF Honington.
Last week his girlfriend, April Oliver, 21, revealed she is expected his baby which is due in late spring.
Mrs Urquhart said: “Corrie and April were on dating sites, they are young and were enjoying themselves. They were both seeing other people, this has not been hidden.
“April and Corrie had a Fab Swingers account, to the haters, get over it. This is none of your business.
Ms Urquhart insisted her son's lifestyle had 'nothing to do' with his disappearance
“April could have easily deleted her account as I could have deleted Corrie’s however what was far more important than a little embarrassment was that the police were informed immediately and given every ability to ensure this did not have anything to do with Corrie’s disappearance. Which they are still doing.”
A spokeswoman for Suffolk Constabulary said: “Police are aware of the social media and websites Corrie was using and this is part of our investigation. We will not be commenting further at this time.”
Mr McKeague disappeared when he was separated from friends while leaving the Flex nightclub on St Andrews Street South.
He was last seen in Bury St Edmunds town centre on CCTV at 3.25am, wearing a light pink Ralph Lauren shirt, white jeans and brown suede Timberland boots with light soles.
MISSING RAF serviceman, Corrie Mckeague
Mon, January 9, 2017
Corrie Mckeague, of Dungermline, Fife, has been missing since he disappeared after a night out in Bury St Edmunds, Suffolk on September 24.
The 23-year-old's girlfriend, April Oliver, 21, of Norfolk, revealed she found out she was expecting his child two weeks after he vanished near RAF Honington where he has been based for three years while training to be a gunner and a medic.
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April Oliver, 21, girlfriend of missing 23-year-old Corrie McKeague (right), who has revealed she is expecting his child
The last sighting shows him walking from a shop doorway and into a horseshoe-shaped area in Brentgovel Street, with no sign of him emerging.
Officers combing through CCTV are still seeking to identify two people – a cyclist in one CCTV image and an older man in the second CCTV still.
Three potential witnesses have been identified following an appeal.
He had been separated from friends while leaving the Flex nightclub on St Andrews Street South.