I'm thinking that there isn't a whole lot of games that focus on love and romance. Sure there's romance in games, Final Fantasy and most RPGs for that matter, Monkey Island, Zelda, and so on, there are couples, and legions of 'em, but the relationship isn't the center focus. Sure, there are graphic novels, but honestly, I've no interest, I have no idea how to even get one. The only game I can think of is Catherine and while on the surface it's not a bad choice for the standard Valentine's day game, it's not as much in the spirit of the holiday as one might think. It's like picking Amores Perros for it's romantic value; sure, Love is in the title, but that's not really what you should be getting out of it.