Christine and David are ready to bring some European flair to the SWING house. Transplanted from Germany, these two have been together for over 24 years and still declare that they are madly in love with each other. It's just that somewhere in between David's busy high-tech job and Christine's housewife/mom duties, the spark seems to have dimmed a bit. Could a weekend couple swap help turn on the passion? Christine is definitely more hesitant than David to dive in to ''the lifestyle,'' but they've signed the contract and there's no turning back now. Of course, they're still adamant about laying down the rule of ''no solo hookups.'' Whether or not they obey it is a totally different story.