Swingers: Inside the Secret World of Sex Parties

Some couples say hooking up with strangers together, instead of cheating, helped their marriage.
5:29 | 06/28/14

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Transcript for Swingers: Inside the Secret World of Sex Parties
And next, it's the young and the restless. We're going to meet some couples who say their unions are more secure and more honest because they don't believe in mog nothing my. They swear the secret to staying together is not having secrets at all. I have been dying to wear this skirt. I have just been wanting to wear it. These sexy guests are all dressing to impress for a top secret invitation-only party. They're all in committed relationships, but tonight, they're hoping to hook up with the other party Goers. They're swingers, who find passion with strangers. We're excited. Yes. Finally here. Our story begins two years ago with these two curious couples. Ginelle and Steven. Stuff that people do they want to try. Do you think we can do that? And Michael and Sara. How did this all start for you? We made a bet for the super bowl. If the patriots won, I got a free fling with another guy and if the giants won -- I got a threesome with another girl. And needless to say, the giants won. Call me old fashioned, but isn't there something odd about seeing your mate with somebody else? I mean, we're not really the jealous type. We believe that sharing is caring. Welcome to behind closed doors. Attending a posh swingers party like this is a first for both our couples. And here, the party Goers are strictly V.I.P. They've been carefully selected by event hosts behind closed doors, based on attractiveness and age. The younger, the better. New Jersey couple Michael and Sarah have been together for years. We met online. Yeah. Which was, I think, new for both of us. Have the way through our relationship this is when we really started exploring this and it's great. There's no turning back. We love it. We love what we do we love our weekends together. They do full swaps, which means going all the way. But some thing, they keep for themselves. The first rule is no kissing. Kissing is very intimate with us. We finish with each other, I guess, would be the nicest way to say it. Janel, a property manager, and Steven, a D.J., say they lead sort of a double life. Private life should be private. And I mean, doing something like this, I'm not going to go to work and say, guess what I did this weekend. But there's no shame. They're into soft swapping. Which means everything but full intercourse. Guys with their favorite car. You let someone else drive it. You can drive the car. But that's my car. That's a good analogy. Both couples are part of a dramatic shift in attitudes about what it means to be in a committed relationship. One recent study shows 41% of couples are open to the idea of having multiple sex partners. And apps like tinder and ok cupid make finding exactly what you're looking for, whether you're single or a couple, easier than ever. This is swing school. And swing school is how we welcome beginners into the lifestyle. Before the party starts, rules are laid out. Single women or couples are allowed, but no men flying solo. The price of admission? 200 bucks. It's all perfectly legal. Everyone is a consenting adult. And every one, they say, practicing safe sex. And these conditioned swingers share advice with our couples. Jealousy is not an issue. Because if there is, the Li lifestyle is not for you. If you are jealous, then you have that fear you're going to lose someone. And I think individually, we're the best we're going to get. As night falls, the room gets darker. The mood, sexier. Mike and Sarah have now scoped out the room. There's an asian woman here that Sarah was looking at and I kind of agreed to, also. We got the girls together finally and we're going to take this to the next step, I believe. They start to get frisky, kissing each other, hoping to get things started. It quickly gets a little too sexy for our cameras, so, we retreat to our private interview suite, where couples swing by to let us know what's going on up there. What happened? Sarah and I commandeered one of the couches and somebody else came over and joined in. You kissed her, then what happened? The magic happened. You had sex with the other woman and you had sex with the other man? Yes. A lot of older people, like, their families are very traditional -- you sleep with one person forever. But in today's day and age, things are not the way they used to be. For Janel and Steven, the party wasn't exactly what they were hoping for, but the night is still young. What happens when you get home? Oh, it's on. That's all I can say. Michael and Sarah are more willing to kiss and tell. I really get turned on watching Michael please somebody else. Because I know how well he pleases me. And I know at the end of the day, like he said, I'm going home with him. There's nothing better than us. Like, we please each other so well. And today, that's still true. Both couples are still together and say swinging makes their relationships even stronger.

This transcript has been automatically generated and may not be 100% accurate.

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