Alexander the Great is another popular example. Even though the available historical sources clearly indicate that the Greek king had different female lovers each night, he is considered the most famous gay man of antiquity, simply because a screenwriter in Hollywood imagined him as one. In reality, Alexander the Great most likely slept with more women than Hugh Hefner! But how did we end up with these false misconceptions about ancient Greek society and homosexuality?

The whole thing officially opened up by Kenneth Dover's work Greek Homosexuality in 1978. Since then, as MacDowell points out , homosexuality in ancient Greece “has been discussed a good deal, mainly from a sociological and anthropological point of view.” However, few mention Athenian laws against homosexuality . It wouldn’t be much of an exaggeration to speculate that a decorated and experienced historian such as Dover avoided this account of the official stance of Athens on homosexuality. Instead, he based his research and conclusions on certain pieces of such art as vase painting... However, few mention Athenian laws against homosexuality.

https://www.ancient-origins.net/history/homosexuality-ancient-greece-0011232