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Male infertility

Infertility is when a couple cannot get pregnant (conceive) despite having regular unprotected sex.

Falling sperm counts ‘threaten human survival’, expert warns

How to produce sperm and eggs ?

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In 2006, a Japanese researcher, Shinya Yamanaka, showed in mouse cells that four transcription factors are sufficient to restore differentiated body cells and the genetic information in their nucleus to the state of embryonic stem cells: Oct4, Sox2, Klf4, and c-Myc. This discovery surprised many scientists and changed our understanding of how cells work.

Source : https://www.understanding-stemcells.info/basics/reprogramming.aspx