A Bluebeard is a Male Black Widow

Since the Marvel Cinematic Universe was created, Black Widow has become well-known. You are familiar with Scarlett Johansson's character even if you are unaware of the spider that gives the moniker. The term "Black Widow" can also apply to a woman who seduces and marries a guy before killing him and taking his money. This third Black Widow is also very well known.

Although the term has a very strong association with something female, a masculine equivalent has also developed over time. The derivation of this one is a little more uncommon because not many male arachnids or insects kill their mates the way spiders do. A Bluebeard is a man who seduces, marries, and then murders his lovers.

The name is derived from the well-known folktale from the late 1600s about the titular character who keeps the bodies of his ex-wives in a room. The motif appears frequently in fiction, albeit perhaps not as frequently as the Black Widow.