The only one I recall off of the top of my head is La Cage au Folles- a comedy about a gay couple whose straight son marries a girl in a very conservative family. The girl is asked for her family to meet the parents.
Scientists estimate human population to be between 4% and 10%. According to US Census bureau, the current world population is estimated at: 6,900,385,814. the minimum 4% then would be: 276,015,433.