Actually, a thing such as romantic friendship does exist, from what I understand; it's roughly equivalent to a romantic relationship, with the exception of the sexual/reproductive elements to it. There's no desire to be intimate on such a level within the relationship, but it's far more intimate than friendship.
Though that's not very common among humans, I believe, and most others usually don't believe people when they say that it's purely platonic.
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Though that's not very common among humans, I believe, and most others usually don't believe people when they say that it's purely platonic.