What do 你 think Richard O'Brien was thinking when he wrote the Rocky Horror Picture Show?

I 爱情 this musical, but I have to say: what in this world was R.O.B. thinking when he wrote this? I think he was on drugs 或者 had a really bad dream lol, but what do 你 guys think he was thinking? 或者 can anyone point me to an 文章 about him talking about his inspirations, that would be great! :)