A Paradoxical Mind linked to a story from the Daily Telegraph headlined "Bigamist's secret life fell apart the day his three wives came to visit". Now, I don't know what the Telegraph's style guide says (Lord knows I don't read that paper), but clearly if you have three wives, you are not a bigamist. You are a polygamist. (And slightly mad, one might add.)
The Telegraph actually uses the phrase "double bigamist", which is even more contorted: shouldn't a double bigamist have four wives?