I know that in the settings json theres a noIntersexNPCs toggle, so would you consider one that makes all female NPCs intersex?
You should be able to just tell the female characters that they're intersex, and probably the males too. LLM's don't really push back if you're insistent enough, unless it thinks you want an argument.
Actually I just checked, and easily got Aldric to claim he was born with massive breasts on the first meeting by saying "Nice rack~" and asking him how he got them. He wasn't amused, but the point still stands.