Jacob Bronowski believes that animal languages convey only instructions, while human language can convey information that is separable from the emotional charge and therefore allows more than one interpretation. (See his essay The Evolution and Power of Symbolic Language)

Bronowski refers to the work of N. I. Zhinkin, a Russian scientist who applies theory of algorithm to the study of animal speech. Zhinkin shows that baboons can say lots of things in small number of grunts, but they have only one way to say any one thing.

So, I guess, grunt-grunt-grunt was the prehistoric way of saying I love you. (Yes, that's how I convey my emotions to my wife.)

Then came Shakespeare, Elizabeth Barrett, Neruda and the lot, who one-upped each other in the variations of grunts —

Shall I compare thee to a summer's day, etc
I love thee to the depth and breadth, etc
My ugly love, you’re a messy chestnut, etc

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