You know why a movie makes a great date?
Because although you don't actually do anything besides staring at a giant screen (together) a movie brings the both of you on a journey - be it to the far reaches of the universe, or the intimate surrondings of a budding relationship. You experience life (and probably death - someone must die in an action, drama or horror film) and are made to feel you have been thru an enternity together.
It also has the intimacy of a camp-fire ghost story - the "sssh don't tell anyone" type - and provides that shared experience you can talk about later.
And best of all - besides buying the ticket and popcorn set, you don't have to do a thing.