That's what you get in "escape hatch theology"---there are rationalizations for everything.
At first they can say that "red" is "red", then turn around and say "red" is "black", and believe both statements are true. Everything is in the "grey area" as Satan likes it.
Having said that, the RCs aren't the only ones suffering from the kind of cognitive disconnect that relativism produces---many mainline Protestants and Pentecostal Charismaniacs suffer the same affliction. I'd go so far as to say that most of American Christendom suffers from the affliction of relativistic cognitive disconnect.
What parts of "chastity" and "intrinsically evil" don't you uderstand?
SD