Most Helpful Guy
Of course we notice different smells =P. Nothing too over the top during the day/time when you always see each other. But on special occasions, or at night, or when you go out with each other, its nice to put something sexy, sensual, seductive, etc on.
Since I don't have a girlfriend I will say a bit about that. If I am looking for a girl, obviously the more over the top scents are going to lure me in. Don't overdo it though because that's a turn-off, but something more than ordinary is nice. So if you are a girl and are looking for a guy, its nice to put something on that will get noticed, none of the spray stuff...perfumes work better.