Having sex in tight confined spaces for the sole purpose of procreation to populate a country, to preclude the need to find housing for planned marriage.
Real life Minister of state Josephine Teo was quoted in the news of Singapore telling young couples to put off getting housing as she does not see the lack of privacy and personal space as a hindrance to having sex.
As the birth rate declined, young fertile men and women were urged to do The Josephine Teo, and delay plans for acquiring housing until after their children are born.