For Valentine's week, the Poet Laureate, Carol Ann Duffy, celebrates the long tradition of love poetry, in a series that examines poems from each stage in a relationship. In conversation with other love poets, Carol Ann explores some of the world's greatest love poems, as well as some hidden gems. What makes the perfect love poem? Each of the five programmes in the series examines a different stage in the development of a relationship and today's episode looks at poets' different seduction strategies. Presented by Carol Ann Duffy. Produced by Emma Harding.