Earlier quoted context omitted.
Much like saying "murder is wrong", the wrongness is a part of the definition of the word. There's no need for evidence or logic, beyond understanding what a definition is.
Neither rape nor murder are inherently, definitionally wrong. There are situations in extremis where murder and rape are considered justifiable: in war, murder is often praised; and in an "everyone else is dead, humanity will go extinct" situation (e.g. the subjective belief of Lot's daughters, according to some traditions, in Genesis 19:31–36), rape might¹ be considered permissible. And both words are used to refer…
This is easily refuted: look up “murder” in any English dictionary and you’ll find a definition like this: “the unlawful premeditated killing of one human being by another.” The inclusion of “unlawful” makes it definitionally wrong. You might want to quibble about legality vs. morality but in this case at least, the one entails the other. Perhaps you’re thinking of words like “killing”.