Same word as xrating:

X-rating, abomination, affront, atrocity, bawdiness, blight, blueness, coarseness, curse, dirtiness, dirty name, dirty word, evil, filthiness, foulness, four-letter word, immodesty, impropriety, impurity, indecency, indelicacy, lewdness, licentiousness, lubricity, offense, outrage, porn, pornography, profanity, prurience, salacity, scatology, scurrility, sleaze, smut, smuttiness, suggestiveness, swearword, vileness, vulgarity, wrong