I Should Have Married What's-His-Name

Jim and his wife Harriet are in a furious argument on their way to the Center for Marriage Counseling. Turns out they are the marriage counselors! Their argument resumes later and escalates while having sex! Finally, they threaten to check out their old flames and promptly set off to do so. They encounter Jim's ex, Sally, a total airhead, whose wealthy husband soon has eyes for Harriet; Harriet's ex, Nelson, an artist so stoned he answers questions by repeating them (Q: How are you doing? A: How am I doing?); and Adelaide, a high school girlfriend of Jim who has blossomed into a 300-pound nymphomaniac. The mayhem peaks when all go for a cruise on the yacht owned by Sally's husband and Jim and Harriet end up swimming for shore.