He believes that the government should have no laws against an individuals right concerning their private use of pornography (with the exception of CP).
Here is his free book he wrote in 1988 about what he stands for and talks about his views... including on freedom of pornography.
www.mises.org/books/freedomsiege.pdf
Get involved, donate, campaign, vote in the primaries and make a difference.
A good place to start is at: ronpaul2008.com and ronpaulforums.com