Protoss 1: "Humans are soooo primitive. They have mouths! They use their orifices for talking!"
Protoss 2: "...And eating."
Protoss 1: "Yeah, eating." *shudder* "Wait, why are you blushing?"
Issues that can be easily solved by using "porn-logic"
Why would Protoss or Zerg even be able to fuck humans? Because it's porn.
Issues that need actual justification within story:
Sharp claws on Zerg and those huge nails on Protoss. These will cause complications until a human partner complains and demands to do a pedicure for safer fingering.
Protoss as a race has never been prolific to the point where the Xel'Naga had to give them technology to increase their population growth
Perhaps some protoss splinter group discover that Terran/Protoss hybrids reproduce more quickly "the old way" than whatever way protoss/protoss reproduce
Zerg sex would be harder since Zerg are scary and full of teethCould be a long con or something to do with primal zerg
Zerg related stories would probably be mainly about non-con and mind control. Perhaps with Zergs "infesting" Terrans in a more sexual manner, or straight up monster-fucking with the Zerg as the monster.
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