I was so impressed by Samantha that I rented Code 47 shortly afterwards (or 46, I can never remember which it was). It's a scifi film where code 47 means that you shouldn't have sex with your family member. The idea, as far as I can remember, was that people were created often from dna samples, so it was possible to meet a stranger your age who was, dna-wise, your mother/father/sister/brother. Creepy. And hence the possiblity of becoming attracted to your genetic mother/whomever and engaging in incestuous intercourse. Whatever floats your boat I suppose, but at least they tried to avoid it.
The core of the film is a sad love story between an older man and a younger woman, she being the genetic mother of the man, if I recall correctly. (God forbid that I should check all of these points in imdb.) The music was so sad as well.