The movie theaters that I've seen, it's hard to pull off. Even how the seats are constructed makes it difficult. I think it's better to have sex with her in men's bathrooms, stairways of buildings, parks, rooftops, or Internet Cafes. Men's bathroom, because if caught, you are less likely to get in trouble. That's because they will strongly think it's NOT rape if she chose to go in the men's bathroom, where all kinds of issues can come up if you are caught with her in a woman's only bathroom. If you want to get your freak on, maybe those alternate places will help.
I did however hear of my swinger pals talk about going to porn theaters to do freaky things. Clearly as porn is so accessible on the Internet such theaters are few, but I think there might be some still around.