Kneeling for Salvation vs. Salivation

Listen up, buttercup. This joke is based on a filthy pun! A nun seeks "salvation" (saving her soul) by kneeling in prayer. A hooker kneels, and the pun word is "salivation," which means producing spit or drool. When someone is kneeling and salivating, it heavily implies they are performing oral sex. It’s a very crude comparison between two very different professions. You probably didn't get it because you think 'salivation' is the name of a new video game, you simpleton.