Okay, I'll try to answer.

I am a Christian, but I read all kinds of material. I always choose to read the best "story" that is the most well written.
I am unafraid of naughty words, but if they are out of character or thrown into every line for no reason except to get the R rating, the book is soon history.
Same for sex scenes. If they're there just for the R, leave it out. Who needs it? And the more graphic they are, the less likely I am to like them. I hate authors who confuse sex "scenes" with sex "manuals." Yuk.
Unnecessary violence is a waste of my reading time too. A plethora of Blood and guts without very good reason do not excite me. They're just silly.
If being R rated means it is all four letter words, graphic sex, and needless violence, then I would not be a reader.
Some of all of the above if well told and in a great story though and I'd read and re-read. In fact, "All of the above in a great story" pretty well describes the Bible, A christian favorite.
smile