In a new study conducted by the University of Utah, researchers suggested that men with low sperm counts are more likely to develop testicular cancer than fertile men.
It is not the first time a connection has been made between fertility and cancer risk.
A research published in 2013 found that men diagnosed as 'azoospermic' – meaning they are infertile as a result of an absence of sperm in their ejaculate – are as susceptible to developing cancer as fertile men who are 10 years older.
Meanwhile, Danish scientists in 2011 argued that poor semen quality decreases life expectancy, though they were unsure as to whether biological or social factors were behind this.
One argument is that poor sperm quality indicates low levels of testosterone, a hormone that boosts muscle growth, energy levels and cardiovascular health – all contributing factors to long life.