Count Down: How Our Modern World Is Threatening Sperm Counts, Altering Male and Female Reproductive Development, and Imperiling the Future of the Human Race

being an involved dad creates a “dad brain” that replaces his single-man desires. He’ll experience a decrease in the testosterone previously used in the hunt for sex and recovery after rejection, and an increase in oxytocin emanating from the joys of loving and being loved by an infant who needs him.