The new Taco Bell commercial is, in a sense, all about people hitting on each other. In the spot, three different couples -- two co-workers, a college-aged pair with a huge height difference and even an older couple -- agree to leave their respective responsibilities and go have a little afternoon fun as a "delight"-ful little tune plays happily in the background. But it's not what you think: The couples all wind up at Taco Bell, just in time for "Happier Hour." Well, now that we've got that taken care of, what is that adorable song playing in the commercial?

The tune is 'Afternoon Delight' by Starland Vocal Band, and, as expected, is all about middle-of-the-afternoon sex. Even though the song came out in 1976, it has been gaining a lot of traction in pop culture in recent years, due in part to the 'Anchorman' cast's hilarious rendition of it in the 2004 film. More recently, the cast of 'Glee' (notably, Dianna Agron, Lea Michele and John Stamos) performed the tune, while One Direction, Paul Rudd, Will Ferrell and Steve Carrell also sang it a cappella during their opening monologue on 'SNL' to promote 'Anchorman 2.'

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