There's an idea that the human body is somehow evil and bad and there are parts of it that are especially evil and bad, and we should be ashamed. Fear, guilt and shame are built into the attitude toward sex and the body. It's reflected in these prohibitions and these taboos that we have.
George CarlinReligion has convinced people that there's an invisible man ... living in the sky. Who watches everything you do every minute of every day. And the invisible man has a list of ten specific things he doesn't want you to do. And if you do any of these things, he will send you to a special place, of burning and fire and smoke and torture and anguish for you to live forever, and suffer, and suffer, and burn, and scream, until the end of time. But he loves you. He loves you. He loves you and he needs money.
George Carlin