Sue: Wow Linda, you never mentioned that one. What a doozy! It's up there with the guy from my community who seemed to have it all: an adorable two-year-old son, a wife who was pregnant with their second child, and . . . a beautiful Danish au pair. Seems he couldn't keep his hands off the lithe young thing during his wife's pregnancy. By the time the baby was born, the au pair-affair was in full flower and the marriage broke up shortly thereafter. The wife, with a 2-year-old and a newborn, was devastated and it took her years to recover. Happily she eventually met a lovely guy and remarried. Her ex married the au pair and had three kids with her. He seems happy too (dammit!), but will at least be saddled with three college tuitions in his golden years.
Moral of the story: If you're thinking of hiring an au pair, make sure she's extremely unattractive.