And people are okay with it because the humans get together and have sex and semi-mistake each other for the robots, which were each made to (unless they just happened to, it's vague) look like the other human?!
Mind you, it's a pretty good speculative sci-fi story on these counts. Reading between the lines as to what happened, there's some interesting ethical/philosophical questions and such...
But it makes for a terrible romance, unless you're into ironic, heart-wrenching tragedies, of course, which I know some of you are.