Rating?

I realize this movie isn't rated, but could someone who has seen it take a stab at rating it? I'm not talking about personal opinion, but what you think the MPAA would have rated it if it had come out in a theater. I'm trying to get an idea before I spend money. Thanks so much.

And indeed there will be time/To wonder,“Do I dare?”and,“Do I dare?”
-T.S. Eliot