The Glee star appears in a public service announcement for the 'Straight But Not Narrow' campaign, which aims to build a rapport amongst men of all sexual orientations.
"Maybe you like to play football," Moneith says. "Maybe you like to sing and dance. Maybe you like both. Maybe you don't like either. It doesn't matter, just be yourself. Just be you, cause that's good enough for me."
Monteith is also joined in the 'Straight But Not Narrow' initiative by Josh Hutcherson, star of comedy-drama film The Kids Are All Right.
"Does it really matter if your guy friends like guys over girls? Doesn't that kinda just leave more girls for you?" he states in the clip. "And furthermore, we're not going to let anyone say anything bad about anyone ever again in the history of the world."
Other stars participating in the 'Straight But Not Narrow' campaign include Victorious actors Avan Jogia and Matt Bennett.
Glee creator Ryan Murphy recently pledged to continue exploring sexuality in the Fox show through the character Santana Lopez (Naya Rivera), who came out as a lesbian in the recently-concluded second season.
Watch Cory Monteith and Josh Hutcherson's 'Straight But Not Narrow' videos below.