17 episode

Kokoro: No. We're the same as any other animal.
Kokoro: It's what we've done since ancient times.
Kokoro: That's how all living things have kept their species going for thousands of years.
Kokoro: So, well...
Kokoro: That must be why we have boys and girls.
Kokoro: This may be selfish of me,
Kokoro: but I want to leave a mark—leave something behind before I'm gone.
9a: Leave a mark?
Kokoro: Yes.
Kokoro: We've lived our lives believing our only purpose was to ride the FRANXX into battle.
Kokoro: But you know what?
Kokoro: That might not be true!
Kokoro: We could carry new lives and leave them here for the future.
Kokoro: When I learned about that, I was so happy...
9a: Disgusting.
9a: You are absolutely disgusting.
9a: This is ridiculous.
9a: Humans have evolved and cast their reproductive functions aside in the process.
9a: Reject that, and we'll all have to go back to conforming to one gender.
Kokoro: B-But...
9a: Doesn't the thought often cross your mind?
9a: That gender is a pain, an annoyance that's only tolerated to operate the FRANXX?
9a: And that's all it really is.