Persephone: "Styx, I’m so damn horny…"
Aphrodite: "You called?"
The sacred marriage ritual in Sumer was celebrated during a period of about two hundred years, during the third dynasty of Ur. There are many uncertainties regarding the ritual. We don’t know for sure who played the role of the goddess, if a real sexual act really was involved, and what function the ritual played in society. Promotion of agricultural fertility is one theory.
... and Aphrodite possibly is a (partial) continuation of Inanna. Makes sense that she knows of that stuff :)