Joy Ellison:  Their mouths would be [closed 
more], which worked well for the characters and the whole feeling, because the 
bigger picture is an idea of people who can’t 
communicate. They are in a period of time where, there may be a sexual revolution going on in the country but in that particular part of the country, it’s a much 
more conservative, bottled-up, and uncommunicative society. It would be very difficult for people to be open and communicative about these things. Ang was particularly careful about all of it. 
Brokeback Mountain Production Notes