Following Ayn Rand as much as I do, I'd have to say love is a pretty selfish emotion. Instead of thinking of it as sacrificing your wants and desires for someone elses, think of it as your happiness and well-being relying on their happiness and well-being. If they are sick then you can't truly enjoy anything until you know they are ok. If they are unhappy for whatever reason, then you go out of your way to fix it.
If, say, your SO likes to do something you hate. Instead of relying on the activity to make you happy, rely on your partners enjoyment of the activity to make you happy.
As this type of thought is supposed to go both ways, its not so much sacrifice as depending on each other for emotions.
Don't know that I'm really expressing this the way I want. >_<
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