Also, your argument is flawed because there are many people who procreate outside of marriage, and also many married people who are unable or chose not to have children.
Nhlayo ya vona yi katsa vanhu vo tala lava nga si nghenelaka vukati naswona va nga ni ntshembo lowutsongo swinene wo nghenela vukati swin'we ni vanhu vo tala lava tekaneke ni munhu la lamaleke loyi a nga ta ka a nga swi koti ku endla timhaka ta masangu.