For the source text click/tap here: Yevamot 61
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In the Mishnah, Beis Shamai and Beis Hillel disagree about the fulfillment of the Mitzvah of Piryah v’Rivyah.
Beis Shamai maintains that one fulfills the Mitzvah only when he has two sons.
Beis Hillel maintains that one fulfills the Mitzvah when he has one son and one daughter (see Chart).
Beis Hillel derives his view from Creation, when Hash-m created the world with one male and one female, Adam and Chavah.
Beis Shamai argues that "we may not derive that which is possible from that which is not possible" ("Ein Danin Efshar mi'she'Iy Efshar").
The world had to be created with one man and one woman (and not with two men) in order for mankind to propagate. The world could not have been created in any other way.
We explore the current [population growth of Am Yisrael in Israel and abroad and the ethical issues regarding ecology and sustainability.