In any event, we finally get to the bottom of this: Francis went back to the storage area to dispose of Vern's body and saw Wendy leaving. He chased her down and killed her. Francis claims it's because "I tried to protect my wife's work. Not just for us, but for people like us." What, all the people who dabble in surgery?
Anyway, Catherine and Sara are heading out, and Catherine's ruefully commenting that "He admits to murder but not infidelity?" Sara points out that it's possible Francis didn't cheat: assuming he was not in a spitter in one key sense, he'd have had a healthy little sperm sample swimming around his mouth for a while, and when he killed Wendy, he reverted to his spit-flying ways, thus passing on his spit and Dr. Lavalle's semen. Whatever. The real interesting scene is commencing now: Gil is in his office, telling Mimosa, "I thought you'd want to know what happened to Wendy." Mimosa thanks him and says sadly, "Killed by someone in our own community -- as if we didn't have enough enemies." Gil looks sympathetic. Mimosa says, "Her parents never understood her. Still I think they should know. What do I say?" Gil suggests, "Show them an oyster." Mimosa's understandably confused, and Gil elaborates: "There are two types of male oysters, and one of them can change genders at will. And before man crawled out of the muck, maybe we had the same option. Maybe originally, we were supposed to be able to switch genders, and being born with just one sex is a mutation." Mimosa looks up at Gil, comforted, and he sort of smiles.
And I know the oyster scene's supposed to be a sweet little connecting moment between Mimosa and Gil, but it's giving me Spartacus flashbacks to the notorious scene where the following not-heavily-coded scene takes place in a Roman bath as Marcus Licinius Crassus (Lawrence Olivier) attempts to seduce his slave Antonius (Tony Curtis):
Marcus Licinius Crassus: Do you eat oysters?
Antoninus: When I have them, master.
Marcus Licinius Crassus: Do you eat snails?
Antoninus: No, master.
Marcus Licinius Crassus: Do you consider the eating of oysters to be moral and the eating of snails to be immoral?
Antoninus: No, master.
Marcus Licinius Crassus: Of course not. It is all a matter of taste, isn't it?
Antoninus: Yes, master.
Marcus Licinius Crassus: And taste is not the same as appetite, and therefore not a question of morals.