Simpsons Vintage Beefcake Muscle Magazines

Every so often the writers of the Simpsons still pull a good episode of their collective asses.  A few weeks ago Homer bought an old storage locker that was full of things one would associate with either ladies, or a cross dressing gay man.  One of the things of note was a collection of 1950s muscle magazines.  It's nice when the Simpsons gives a nice little nod to gay culture.  It's not exactly on par with their Tom Of Shellbyville, but I'll take what I can get from the show.  Here are the magazines from the show: 

And who owned all this stuff?  Why none other then Grandpa! Does this mean he's gay?

Did Homers Homophobia return?

Was there a more logical explanation?  Thank God there was.  I don't think could have handled Grandpa being gay after all his romantic stories featuring female characters.