Erotic Networks even uses the XXX ratings, not official, but universally understood.
So
Pleasure channel is "X"; totally edited to the point with the other channel available, why bother.
TEN and ETC is "XX", hardcore but edited to allow play across 100% of the US.
Extasy is "XXX", pretty much only edited down to fit in 90 minute block.
goto watchten.com and there is a FAQ, they explain the difference between 3 type of channels offered, and that pretty much deliniates the X-XX-XXX ratings in the real world today.