Even if it is a "Hallmark" holiday...
Making Love: Sexual Love the Divine Way
LoC of this book by Barry Long
Cupid's Poisoned Arrow: From Habit to Harmony in Sexual Relationships
LoC of this book by Marnia Robinson
Soulmate and Twin Flames theory
Similar concepts. Soulmates are said to be souls who have met in other lifetimes. Twin flames are said to be souls who once existed in fusion.
Bouquet of roses
Also: LoC of roses not in a bouquet