Google search
I do not know why some people have a problem with a simple Google search. I do not make anything up. So I apologise to those who are able to do Google search about the following ext, since to most people the following is common knowledge.
GAY
Homosexual. In the 17th cent. the term was expanded from it's earlier meaning of cheerful to refer to men with a reputation for being playboys (gay Lothario first appeared in 1703). By the early 1800s, it was further expanded to refer to women with a reputation for sexual promiscuity. The term was first self-applied in the early 20th cent. By the 1970s, it was a standard, non-slang synonym for homosexual.
Huge population? I doubt it, but there is a large population of Gays trying to pretend they are normal. Normal Men are not promiscuous.