Lee Kuan Yew of Singapore once pushed the idea of legalizing polygamy as a means to counter negative population growth.

Perhaps Thailand is promoting this very idea.

Lee Kuan Yew of Singapore once pushed the idea of legalizing polygamy as a means to counter negative population growth.

Perhaps Thailand is promoting this very idea.

As adultery and more children are not necessarily concomitant, I think this is unlikely to prove to be a solution to your perceived problem