Conversely though, Niko's choice of wardrobe and vehicular transport will also affect whether or not his date has a good time.
Both Michelle and Kate like Niko for who he is, so wearing something upscale (i.e., anything not from the Russian clothes store) and showing up in a flashy ride is typically to be avoided when dealing with either of them.
Putting in a little bit of time to raise the fondness of the girlfriends can unlock their "special abilities": these can help in particularly difficult missions late in the game.
Like the other relationships that Niko has with his friends in GTA IV, favor can be gained with girlfriends by taking them to different venues around the city.
Each woman has different tastes and will respond accordingly.
Reaching 100% fondness with all five girlfriends is not required to achieve 100% completion of the game.
Each friend offers a 'special ability' in return for maintaining a good friendship.