This is a great topic and one that I don't think has been addressed here at least not in my days which date back until 2005. Be that as it may, I think that "Butterfly" definitely refers to Victoria. As previously mentioned. The "Grey" portion of the title in my opinion refers to Fielding Chase. Chase was nothing but a cocky arrogant SOB. I think Victoria was trying her best to break free from Fielding, or if you will wanting to get out from under his thumb. And towards the end of the program she finally gets enough courage to do so. So the butterfly was hanging around in the shade. And the shade of course being Fielding Chase this of course is just one person's opinion somebody else might get an entirely different take on it

"Sex and the Married Detective" is also a play on the book and movie title "Sex and the Single Girl."
(I think that title has been parodied a lot of times.)

Ahhh thanks for the "Sex and the Single Girl" tip, Grant! That's been stumping me for a while now. I was sitting at my computer Googling "Sex and the" over and over, and I think my computer knows me too well because the only results coming up were for Columbo.

Fred, good breakdown on "Butterfly." Now that I think of it, even Fielding Chase's wardrobe seemed to be mostly bland gray suits, etc. That title has always been a favorite of mine because it seemed so obscure, and barely even touches on the murder aspect of the episode.