Mark: I don't have to have kids.
Sarah: Don't say that.
Mark: I don't. I don't need that.
Sarah: You don't know that. I mean you don't know, you know. In ten years from now, it might be too late to change your mind.
Mark: I don't care. I love you. And you love me and that's all that matters.
Sarah: It's not. I couldn't take that away from you. Do you understand?