Okay I understand it's a joke and all but when you beat Dares of Eternity somtimes Xur says "Have your ghosts spayed or neutered." This implies ghosts have reproductive organs and therefore can mate.
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lol sometimes literal translations of cryptic meanings are priceless and should be left undisturbed; however, if you dare to read what i believe is the answer, then carry on; if not, thanks for the gas! [spoiler]our ghost is our ego and yes egos can mate, like rabbits 😂[/spoiler]