@FBM,
Personally, I'm all for instructional porn for the inexperienced, as it could prevent many an accident.
I remember before porn was invented and I was receiving my very first blowjob from Gladys Clagthorpe.
It was her first time as well, so in addition to me not knowing what to expect, she obviously didn't quite understand, as within ten seconds of her huffing and puffing, my bladder had inflated to the size of a basketball.
When she eventually released her grip, I remember making a sort of pfffffft noise from my nether regions and hurriedly zigzagging round the ceiling and then out of an open window.