DIXIE (1976)

 Lots of porn flicks from back in the 70's featured characters who may or may not have been slightly retarded(PRETTY PEACHES with Desiree Cousteau is probably the best examples of this style of fuck movie) and that's exactly what you get here.  In this one we're also told our titular Dixie is very young(14? 15? it's never made totally clear) in addition to being very stupid.  Abigail Clayton stars and she would go on to make a bunch more porn and finally end up in the great slasher film MANIAC with Joe Spinell.  There's really not much going on in this but if you like to watch someone who's clearly not underage but pretending to be constantly get taken advantage of this is for you.  I can't imagine that they could make a porn today even pretending to be a day under 18.