80 - Sex - Art vs Porn

In another addition to our series on Sex, we ponder the gray area between art and pornography and how that line has thinned and skewed over the last few decades. These changes have greatly affected how we see sex and how it ties into various mediums of art. What used to pass for an R rating is now PG-13 in movies for example. Have we made these decisions or were they made for us by the powers that be? And how does one go about deciding which is which?