It has a French name, La petite mort, but it is nearly ubiquitous in Italian secular poetry of the 15-17th centuries, especially when nymphs and shepherds interact. Of course, not every madrigal that references death or dying is actually a sexual metaphor: Gibbon's "The Silver Swan" certainly isn't, for instance, while Arcadelt's "Dolce e bianco cigno" clearly is, an oddity when you consider how often they're paired in modern concerts. And many Italian texts use death as a metaphor for loss or as a literal fact. Here I am highlighting the more obvious examples. [This list is far from complete: I added this Jan 2023, and it will take me a while to go through every madrigal referencing death]