It depends why it's R rated. If all the quotes you use are going to have swearing as every second word, then it's not a good idea, because although you're allowed to have quotes with swearing, most teachers recommend that you keep them to a minimum. If it's just ridiculously violent, then it's probably alright.
Also, there are varying degrees of R rated-ness. I'm told that in the US, you get an R rating for having fuck in a movie twice, which isn't that big a deal. Just avoid those two lines. In Australia, that will only get you an M. To get an actual R rating in Australia, as opposed to MA15+, then you have to have huge amounts of swearing, violence or sex, and the chances of something being inappropriate are much higher than a movie that's R in the US.