There's a big difference between kneeling down and bending over.

In Zappa’s typical bawdy, anti-authoritarian idiom, the line hinges on a double meaning: “kneeling down” evokes voluntary submission, reverence, or deference (to religion, power, or social expectation), while “bending over” carries a sexualized implication of being exploited or humiliated. The “big difference” is therefore about agency and dignity—choosing to yield versus being made to yield. Read more broadly, it fits Zappa’s recurring skepticism toward institutions that demand obedience and his insistence on calling out hypocrisy: outward gestures of respect can mask coercion, and what looks like piety can shade into abasement.