60 Minutes The Science Of Sexual Orientation (2006)

There are few issues as hotly contested and as poorly understood as the question of what makes a person gay or straight Its not only a political social and religious question but also a scientific question one that might someday have an actual provable answer The handful of scientists who work in this underfunded and politically charged field will tell you That answer is a long way off But as Lesley Stahl reports their efforts are already yielding tantalizing clues One focus of their research is twins