Some of Sirius' content is still censored. Hits 1 (their Top 40 channeL) definitely is, and I'm guessing some of their other contemporary channels are as well. The R&B / Hip Hop channels are not.
Correct, but they do this to create "family friendly" stations. Other stations play the same songs uncensored. This is different than being forced to censor/edit songs because of FCC rules.