Inside the man's body: The making of baby fertilizer 10/16/2016 Inside the man's body: The making of baby fertilizer While women are busy maturing a single egg at the leisurely pace of about one a month, men are almost constantly at work producing millions of microscopic sperm, whose sole purpose in life is to swim for their lives and penetrate an egg. While women come complete with all of the eggs they'll ever need, men aren't born with ready-made sperm. They have to make them on a regular basis — from start to finish it takes about 64 to 72 days
Inside the man's body: The making of baby fertilizer While women are busy maturing a single egg at the leisurely pace of about one a month, men are almost constantly at work producing millions of microscopic sperm, whose sole purpose in life is to swim for their lives and penetrate an egg. While women come complete with all of the eggs they'll ever need, men aren't born with ready-made sperm. They have to make them on a regular basis — from start to finish it takes about 64 to 72 days
