Agreed, Stewie was always gay for me, ever since the early days where people considered it to be FG prime. If him being gay was as obvious in these last seasons... I don't know what to say about that, after all, hitting on Brian, his son, having people over at Brian's apartment. There are also other examples as well, but I think that's enough.
I actually knew a gay guy back in High School that dated several women before he came out of the closet. He took a woman with him to our school prom up until Senior year, which was when he came out to people. Sure it isn't the media or anything, but it does show that it isn't limited to the media or anything.