The correct link is
Liberated Christians Polyamory, Swing, Biblical, Sybian Cyber Center
Liberated Christians: Promoting Intimacy and Other-Centered Sexuality
The bible doesn't say a word about swinging. But there was nothing wrong with many wives, concubines and "common" prostitutes (not those in the Temples worshiping the futility gods - idolatry was the sin not sex or being a prostitute)
Marriage at age 12 was based usually on a family deal. Sometimes the bride and groom first met on their wedding day.
A married man could not commit adultery as long as the "other women" was single, not owned by another man. Adultery was by definition a violation of a husbands rights over his wives or concubines.
But if the husband gave permission nothing wrong. Men owned their women just as their ox's etc. This was cultural not from God but never wrong.
Today women have the same right to sexual pleasure and variety that men have always had. In biblical times men didn't need swinging since they could have as many wives and concubines and common prostitutes as they wished. One exception was the elders of the Church's of Timothy and Titus.
If you read my background section, I started out about as traditional, fundamental Christian as you can get from Bible Study Fellowship, Christian Business Men's Committee, even a council with Billy Graham (Lived in Minneapolis there headquarters city).
I started out to prove my conservative, traditional beliefs true vs more liberal ideas. But after years of seriously study and prayer I had to admit I was wrong. That is why I have been so outspoken on the biblical issues.
Nothing I share is just my ideas. Zillions of theologians are pointing out this truth. We have a very extensive book section for those wishing to seriously study the issue and not just take the world from the minister preaching the sins of sex on Sunday:
Recommended Resources
Over the years we we get so many e-mails saying how it helped overcome guilt from Christian backgrounds for being honest about their desires for sexual variety.
In addition even if your not Christian, many in our culture are sex negatively effected by the general society "morals" and we hear from many non Christians who were also helped in their "morality" decisions.