You might take a long time to get to know each other, because in some way, you are not each other's usual types. This doesn't have as much to do with some physical type than with innate qualities that each of you share, which may be in direct conflict with each other. You find that you don't match up well.
Your values are not in tandem, and you could even annoy each other with the things that each of you finds important. You might disagree on money, for example; one of you might love to go out on dates and don't mind spending the money for a nice meal, while the other is more frugal and is very uncomfortable with that kind of extravagance. This kind of difficult interaction leads to arguments that are hard to resolve, because you just don't know where the other is coming from. In some sense, you don't speak the same language of love. You have completely different ways of expressing love and affection, and the ways in which you do so could easily just fly over the other's head, not registering on their radar of love. You both might end up feeling unappreciated, unloved and generally neglected. In order to avoid this, you both have to talk openly about your own experiences with love -- translate your language for each other, so to speak. If you can cue each other in on how you're showing affection, your partner has a better chance of picking up on the signals.