There is romantic love, which is love with a bit of lust thrown in. I suppose there is spiritual love, though I'm not quite sure what that one is. There is true love, which can't be defined except to say that I'm told you know it when you see it. I've given some nice categories of love, but I still haven't really defined it. The specific emotions depend on what kind you are talking about.
Common courtesy is very prevalent in the family type of love.
Respect and admiration get thrown into several forms. But even so, love is still something more than respect, admiration, and courtesy. When you truly love someone, you would do just about anything to keep from hurting them. Not for altruistic notions of denying one's self, but because knowing that they are happy really and truly makes you happy, and when they cry, their tears are yours. When you love someone, you open yourself up to being hurt by them, but for some reason, you really don't mind.