Well it's an odd film in that it clearly *is* SF, but it also postulates no significant new technology - it merely exaggerates the world and attitudes of today using one particular SF concept (the infertility) as a catalyst. Which is just the kind of thing that leads mainstream authors to make futile claims that their novel is not SF, even though everyone knows that it is. But I could understand why the film might not come across as overtly SF in a lot of ways.