spontaneous sex/foreplay moments?

I was enjoying the new hunger games movie and all of a sudden my boyfriends hand is in my pants. It was really sudden but it turned me on so much, I finished while a really sad scene was playing... when I became aware it made me feel bad. But i don't know where that action from him came from! So hot and so random and AND in a theater full of people!! He's never done that before. I asked him if he enjoyed the movie and he said no, I was bored and I was falling asleep and expected more. I did return the favor, once we got back to his place ;)