If you're the sort of guy who cheats or is just polygamous it's a perfect set up because the wife is not supposed to ask any questions about your work. You're gone on business for days or even weeks at a time on occasion.
If she asks questions and you tell her the truth she could be in danger from either side of the law. So all in all as she's just better off knowing, but not asking I think.

"When the snows fall and the white winds blow, the lone wolf dies but the pack survives."
Winter is Coming

Now this is the Law of the Jungle—as old and as true as the sky; And the wolf that shall keep it may prosper, but the wolf that shall break it must die.
As the creeper that girdles the tree-trunk, the Law runneth forward and back; For the strength of the Pack is the Wolf, and the strength of the Wolf is the Pack.