In Greek mythology, the king of the gods, Zeus, is constantly cheating on his wife and siring children with other women.  In this particular myth, Zeus seduces a young nymph named Io and when his wife, Hera, comes down to Earth because she’s suspicious of his actions, he turns Io into a cow.  Hera asks for the cow and keeps her in captivity until she escapes, but Hera sees through it and sends a gladfly to constantly sting her.  She is chased into Egypt and turns back into a nymph there.

Zeus is constantly doing these things, but Hera always punishes the girls.  The binary here is how men can cheat and get away with it, but women are puns and tools.