Yatori is special to Ikta and vice versa. Sleeping with her trivializes that, and thus it won't happen. Sex isn't the only identifier for closeness and mutual value.

Ikta failed this episode. The moment they said that items were being carried over, I knew they were cannons, because, what else would they be??? He DOHd this time. This is especially blame-worthy because he knew of the tech beforehand. I hope he redeems himself in the final episode.