Despite Liiza having fully recovered, being a mother turned out to be busier than either she or Khan could have imagined, especially due to the situation and how unique their daughter was.
The mostly empty planet offered much room for privacy, but Khan and Liiza couldn't just disappear for hours on end. Savdat could contact them at any time to convey the Elders' decision, and improving their public relationships with the Niqols had a chance of affecting that choice.
Doku and Snow also weren't people, or birds, Khan and Liiza could ignore, especially since the former kept throwing parties at night.
Those social gatherings would often lead to private and intimate moments. It would even be proper due to the Niqols' customs, but Yeza's hunger prevented the married couple from even attempting to vent their built-up lust.