Hey OP. I just wanted to mention that I have the exact same reaction when there is a sex scene in a movie. I don't know why. I'm not a total prude (although my family will say otherwise, due to me constantly finding a reason to leave the room if I know a sex scene is about to be in a movie), I am really active in researching/educating people on BDSM and safe sex etc., and I can watch porn alone, but for some reason a sex scene in a movie makes me so anxious and uncomfortable I want to run away and hide. I also am slightly sad when my partner watches porn, although I do understand it and allow it, but I am not yet at a point where I can watch porn with them although I would like to be eventually. I don't know if your wife will be able to explain what makes her so uncomfortable as I can't. One thing that helps a lot for me is if my partner makes silly jokes mocking the movie's sex scene. It just helps make it less awkward even though it means I have to acknowledge what I'm watching. I would ask if she would be comfortable with you watching nonpornagraphic movies containing sex scenes alone and researching whether a movie contains them before watching them together. I would hope as a wife she would at least be willing to compromise instead of telling you you're not allowed to watch these movies alone.