Earlier this year, high school students in Montgomery County, Md., received flyers at school saying that being gay is a choice and that people can change their sexual orientation. The flyer’s message is a popular and harmful piece of propaganda about LGBT people – the claim that gay people can change their sexual orientation through what is commonly known as “ex-gay” or “conversion” therapy. It’s a notion that has been rejected or highly criticized by every mainstream American medical and mental health professional association.