In regard to the opening of Lucretius referring to interaction between Mars and Venus, I know personally that I've always associated the allusion to mean something like "Venus - good / Mars - bad." However I now see that the original Greek mythology behind their relationship appears to be more subtle, with Venus being at one point in love with Mars, and that they were sometimes cooperative in ancient artwork.
I've collected several references, and I'm starting this thread to discuss whether there are subtleties in this relationship which would give us a deeper understanding of Lucretius' depiction of their relationship. I would especially appreciate comment by Elli or others who are more well-read on Greek mythology.
Ares & Aphrodite - Ancient Greek Vase Painting
https://www.theoi.com/image/K9.1Ares.jpg
This wikipedia article in particular is helpful:
"Aphrodite The Warlike"
Aphrodite Areia (Ancient Greek: Ἀφροδίτη Ἀρεία) or "Aphrodite the Warlike" was a cult epithet of the Greek goddess Aphrodite, in which she was depicted in full armor like the war god Ares.[1] This representation was found in Sparta and Taras (modern Taranto). There were other, similarly martial interpretations of the goddess, such as at her Sanctuary at Kythira, where she was worshiped under the epithet Aphrodite Urania, who was also represented as being armed. The epithet "Areia", meaning "warlike", was applied to other gods in addition to Aphrodite, such as Athena, Zeus, and possibly Hermes.[1]