Even if it was on MTV, not well known for its pro-gay programming?
Something is wrong with that premise -- as I understand it, it's usually men, not women, who believe that size matters: every inch increases your erotic desirability for gay men, and for straight men, your overall worth as a human being. So the nerd's not getting more cheerleader-models.
1980s teen nerd comedy, with the nerd RJ (Paul Iacono, below) torn between the girl-next-door who has a crush on him and the Girl of His Dreams, who is dating an abrasive jock (Jayson Blair, top photo). He also has a portly best friend (Jareb Duplaise, seen here in Epic Movie).
It's all actually rather pleasant, with an enormous amount of beefcake, some bulges, and virtually none of MTV's trademark homophobia.
Jayson Blair has played several gay characters, and in The New Normal (2012-2013), he played the estranged husband of the woman who becomes the surrogate for a gay couple.
Get Season 2 for the male stripper and gay kiss episodes.