Roman historians were known to slander anyone they did not like. But in the case of women it was especially egregious since they were almost always described as being hypersexual. Most of their accounts were written several hundreds of years after their subject's death.
They have described Cleopatra as someone who frequents orgies, had harem of young men and that she was willing to sleep with anyone as long as they agreed to be executed in the morning. Pliny described the wife of the Emperor Claudius as secretly going to the brothel to prostitute herself and having won a competition with the most popular whore there.
Helen of Troy/Sparta has suffered a similar fate. Her part or responsibility in the actions of Alexander/Paris often reflect what a particular society and a time period think of women in general.