Wal-Mart keeping the smut from the children

I love movies more than a lot of things in this blessed world.  I have a collection of DVDs that would take me more than one year if I were watching one per day.  So as you can see  I have a little experience in buying DVDs from places which does include Wal-Mart on occasion (those 5 dollar DVDs are hard to pass up sometimes).  However sometimes I run into the problem of having to buy a DVD that is rates higher than PG-13. I know that is my first problem is watching those dirty movies but I can not help it.  But when I buy a DVD at Wal-Mart that is rated higher than PG-13 I have to show that I am over the age of 17 and if it is at the self checkout lanes I have to wait for a teller to come put in a code so that I can scan the DVD.  This might not be a problem for most people but when my collection of 400+ DVDs is made up almost half of these filthy movies I tend to run into this problem a lot.  The funny thing is that I only run into this problem when I go to Wal-Mart which I think is funny.  A couple of years ago I wrote a paper on the MPAA and CARA who are the people that rate the movie that are shown in theaters in America.  These companies were established in1968 to keep the government out of rating movies.  They also have said that the movie rating system is only suppose to be used by people with kids.  So if you are over 18 and do not have kids you should not pay any attention to this system.  In my opinion and since you are reading this you are interested in my opinion if the rating system is for parents of children 17 years and younger a corporation should not be the ones that enforce the rules.  I am sick of wanting to use the self checkout at a Wal-Mart and have to wait for a teller to punch in the code and even sometimes check my ID to make sure that i am over 18.  If it is a NATO owned theater I understand because they want to keep showing movies but a store should not be so worried about people buying all of the smut that is out there.  

P.S. For more information about the system I can send you a paper on the subject, you can watch This Film is Not Rated, or just check out the MPAA/CARA website.