Relationship counsellor Tony Moore from relationships ireland.com says he's seen first hand the damage a swinging lifestyle can do to a marriage.
"It can have a devastating impact on a relationship," he says. "Often one person, and it is usually the woman, feels coerced or under pressure to join in. If it's not a mutual decision then she can end up feeling dirty and used."
He adds: "There are other problems, too, like the stress it can generate worrying about keeping the lifestyle confidential, the prevalence of alcohol at parties and concerns about sexual health. Eventually it always ends in misery."