I have to think hard because most of the poetry I read is not exactly light hearted.
I guess No Second Troy by W.B Yeats. if that could even be called a love poem.
Though my favourite love poem would be Apple Tree written by someone special for me.
"With each rapturous bite, you gave kiss to my lips
So that we both could share the juices
Of creation, of nourishment, of lust
But most of all...Truth"
"Like Sand underneath the snow, I make you mine." Kristin Hersh