Click on the link below to watch extra footage of scientists talking about the difficult life of sperm.
Film 1: The Sperm Production Process 1, Dr Allan Pacey
Film 2: The Sperm Production Process 2, Dr Allan Pacey
Film 3: The Truth About Pre-ejaculate Fluid, Dr Allan Pacey
Film 4: Identifying Female Fertile Days, Joanna Elington
Film 5: The Moment of Conception, Joanna Elington
Film 6: The Male Biological Clock, Dr Allan Pacey
