Most Helpful Girl
depends what kind of a guy he is, hairstyles usually match their personality/behavior. well at least that's the way I like it.
sweet/innocent guys-->longer hair but not girlie hair (I hate when they have a nice head or hair and its the perfect length and it looks really sexy and they suddenly decide its too long and cut it off, then they look kinda cute, but they used to be HOT)
bad boys/eccentrics-->shorter hair is what I prefer
it also just depends on his face but those are the majority