Most Helpful Guy
Not unless it's true. Some guys may say it, among other things as means of getting you to lower your guard so they have a better chance of getting you into bed, but for the most part, guys only tell you that when it's true.
Most Helpful Girl
I've heard it a couple times lol. I have this male friend who just randomly sniffs me and then tells me I smell good sometimes. If I wouldn't know him that well I'd be 100% sure he's a psycho killer.