Actually, you could as well argue that it's the imposition of morality, through the criminal justice system, that fills up the prisons. The demonization of pleasure through laws that regulate drugs and consensual sex is definitely moralistic -- as is turning sex into something that can only be talked about at home.
An example of the way sex is especially demonized: We attempted to impeach Clinton for lying about a blow job. Now we have Dubya and his cronies lying repeatedly about Saddam Hussein and Iraq. Which is the more serious lie? A curious logic has developed among the right: As the lies legitmating the invasion of Iraq are exposed, the right simply creates new rationales. We went from being under nuclear threat to being the liberating salvation of the Iraqi people. Dubya, according to his friends, sees himself as called by God. Iraq is in part a war on infidels.
The right makes quite a fuss about its support of individual rights but, now that it has ascended to power in this country, it is rapidly going about the business of attempting to impose its morality everywhere, diminishing the freedom of individuals -- whether its women's right to have abortions, the right to end one's own life under medical supervision, even the right of due process. There's a reason John Ashcroft equates, literally, terrorism and drug use. It's the same logic that partially underlies the invasion Iraq: Get the immoral infidels.