I suspect obscenity prosecutions follow the political winds, as opposed to political ideology. Porn outrage creates a great diversion from important things, and is an easy way to get religious people to cotton on to you.

True there were few obscenity prosecutions during the Clinton years, but with Bill's personal troubles it would have created even more late night comedy fodder.
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"All my years in p*rn didn't quite prepare me for childbirth. I mistakenly thought all the stretching I did would make this easier."