Ok, I found this detailed info on the Simpsons episode. This description doesn't mention Al voicing a gay character, but even if he does, so what? It's just a character in an animated series. Anyway, if you want to know more, scroll down. If not, don't.
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Ok, here's the scoop:
About: Three Gays Of The Condo - 04/13/2003
Homer finds a letter that Marge wrote in the '70s that states she and Homer could never work as a couple. When Homer asks Marge if he ruined her life, she admits that he does drive her crazy at times. Upset at her revelation, Homer moves out of the house and in with a gay couple named Julio and Grady. At first Homer is a bit shocked that he is living with two gay men, but soon he is hanging out at their favorite nightspots, enjoying delicious breakfasts and a neat and tidy apartment. When Marge visits Homer and declares her love for him, he maintains that living with Julio and Grady is a great experience and he may never come home. Determined to win her Homey back, Marge turns to guest star Weird Al Yankovic for help. She recruits him to serenade Homer with a rendition of "Jack & Diane" -- with alternate lyrics of course.