(Noctis takes another sip. Compared to Prompto, the prince's nervous energy is quiet and contained, but it exists. He's talking about sex with a stranger.)

But they're getting their data from our bodies, and without the sex, there's no data. (And the data is what leads to the cure.)

So, the longer we hold out, the harder's it going to be for them to cure the disease.

(As the prince of Lucis, Noctis can't allow that, not from himself.)