well in a technical sense guy approaches girl and thats the way it always usually has been, a sense of chivalry, but in these days when girls can be teases, or guys can be looking to just fuck around, it causes both sides to back off due to the slight chance it could be just a game, also not to mention the factor of increased insecurity today. God bless those who are true and approach who they wish, i say it isnt a problem whether a girl or guy walks up to the opposite sex (or the same depending on sexual preference) in order to speak to them as long as they know what they want and feel they have found it.