can I send porn dvds threw USPS Media Mail? ?

That depends on what you are actually sending, your surety the recipient is of legal age, and where you are actually sending it. Different states have different laws, you'll need better answers than what you'll get here. Try USPS.gov and check the restricted items listings.

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Technically such activities are illegal but unlikely would face any prosecution. Such behgan under the Comstock Law of 1873. Anthony Comstock , a postmaster general, helped found the New York Suppression of Vice, close the play, "Mrs. Warrens ' Profession," and enact your new archenemy, The Comstock Act-- through Congress with 100% support. Does that tell you something about Victorian views on smut? Jump to the 1950s and Hugh Hefner became one of most recognizable men to challenge the Postal Service--now there are 1.5 million men who subscribe to "Playboy." Does that tell you anything about modern views on smut? P.S. Technically, all these subscribers are criminals (when ordering through the mail).

Thank you all for your replies and opinions.

Probably...