S1, E1: Infidelity. Is it a salacious act driven by uncontrollable passions or are there genetic and evolutionary forces driving us to seek sex on the side? For decades, tabloids and talk shows have fed the belief that one in three children may be illegitimate. It's a shocking number, one that we put to the test, thanks to modern science and one historic survey. Witness the surprising findings as we conduct the world's first specially designed paternity poll, and follow three people who put fatherhood to the test to find peace.