Annette Bening hopes The Kids Are All Right has encouraged people to become more open-minded about same-sex relationships.
The star, up for a best actress Oscar for her performance as a lesbian mother in the film, said the movie stood for the dignity of all families.
"I think when something is a good movie, first of all, well made, funny, maybe has some heart, that comes first. If you can open people's hearts then maybe people's minds get opened after that," she said.
"I'm proud that the movie does stand up for the dignity of all families, especially for the kids. Those children deserve the same self-respect and dignity as kids from straight parents.
"I hope that does open a few hearts and minds, certainly people that have talked to me about the movie, there's a special grasp I get on my arm from certain people because of what it says about family. Our country, we've got a big tent, let everybody in, I hope people take that away from the movie."
Annette, who is married to veteran actor Warren Beatty, revealed she loved the script as soon as she read it.
"I felt a real connection to the story, I thought it was beautifully constructed in a classic form, and I just had a very intuitive response to the character which is the best you can hope for as an actor," she added.
"Anything intuitive is much richer. I just stuck with that. I've been doing this for a few years now, I've learned a few things and maybe one of them I hope I've learned is if you have that gut level response don't worry about it, just go with it."