Sexual Behavior in the Human Male shocked the world when it was published in 1948 by Alfred Kinsey. It said 10% of the male population was gay and more than one third of men had had at least one gay sexual experience. The report also gave us the Kinsey Scale, which put sexuality on a spectrum.
As you can imagine, the book was controversial at the time. So was the companion book, Sexual Behavior in the Human Female, published five years later. Today, many people say his research methods were flawed, but there’s no doubt that he played an important role in society’s understanding of lesbian, gay, and bi people.
FYI: There is a drag a capella group called the Kinsey Sicks. Check ‘em out. They are hilarious.