So me and my girlfriend are both 16 and we have been dating for over a year and eight months. A few months ago, I admitted to her that I had watched porn a few times while masterbating. This was a big deal because I had lied previously multiple times about it. It was the dumbest thing I have ever done. She was upset for weeks and it still makes her sad to this day, although she has forgiven me. Well we're doing this 31 days of sex thing now and on one of the days we are supposed to watch a dirty movie. She says that she'll be fine, but I know it's probably going to just make her very upset. She is very determined to do this, I think, but I don't want to see her upset. So should I watch it with her? If so, how can I make her comfortable with it, and not break down? If not, then how do I convince her that we don't need to? When she is determined, I can usually never stop her when it comes to these things. Please help!
P.S. The only times I have watched porn since then are when she made me while she gave me a BJ. Mostly it was all okay, even though each time I told her I don't want to. Well eventually she bought me a poster with two barely dressed women on it and out it on my wall. Then a few days later she got all upset from it, so I tore it down, ripped it, and threw it away. After that I put my foot down and told her I'm absolutely done with watching porn while she gave me BJ's. I don't know if this matters, but since then (around 2 months ago), we have been having sex more often than oral sex and fingering.