Let's look at the greek word used for "adultery," then. The verb is μοιχεύω (translit: Moicheuo), meaning "to commit adultery."

Classically, the word appears in such texts as Lysias's famous On the Killing of Eratosthenes. There, it's relatively clear to mean "having sex with someone else's wife."

In the Septuagint (the Greek translation of the Hebrew Old Testament), it has a similar use. You even see it used to describe a women who is sleeping with lots of strange men in violation of her marriage vows in Ezekial 16.

Now that you've learned this, do you still think that the word "adultery," as it appears in the 10 commandments, can be translated loosely enough to include rape?