Love Poem

Why do we have Love Poems? What purpose do they serve? Why do we spend so much time in romantic poetry?

Good poetry will evoke an emotional response. Which also gives me an idea to it's purpose. What if you wanted to evoke a certain response? Could you find a specific sequence of words that statistically will reliably invoke the desired emotion?

Here is the first list of emotions:

Forgiveness
Loving
Compassion
Lust
Guilt
Remorse
Connection
Excitement
Interest
Sad