Well, of course you should take your parents' judgment into consideration. You may not think they know best but on some factors such as what may be the components of love and what's right in a relationship is something they could have derived from experience. I'm not saying that they are to tell you what love is, but they may know and understand vital or rightful components in a relationship that you should consider listening to.

Sure, anyone can plead that 17 year olds are old enough to see R-rated movies outside of school, but that's on their own time. They're responsible for that. At school, it's the school's responsibility. Basically, do what you want at home, you have every right to. But at school, you can do without an R-rated movie. Especially if some of the students are underclassmen. Some of their parents earnestly don't mind them watching R-rated movies. But that doesn't mean the standards are the same in every household. If their parents find out, and become angry, they're not going to go after the 17 year olds who could watch the movies, they're going to go after the school board. This whole problem could be eliminated if there were just no R-rated movies.

It's not hurting you to not be able to watch an R-rated movie. You'll live. It is so far from a vitality of life. For those who want to cry "educational purposes", there are other methods. And a teacher can recommend that you watch it, warn you that it's rated R, and if you still wish to continue, watch it when you're not at school. There are other ways to get a point across that don't require watching an R-rated movie.