When you dig not-so-deep into the lyrics, it's mind-blowing that Nine Inch Nails' 'Closer' has been one of the most popular rock songs on radio for the past two decades.

Although the profanity was censored, the lyrics describing primal sex could not be ignored as "You let me violate you / You let me desecrate you / You let me penetrate you / You let me complicate you" spilled into the listener's ears. NIN mastermind Trent Reznor created possibly the greatest strip club song ever with 'Closer,' which drips out the chorus, "I want to f--- you like an animal / I want to feel you from the inside." The music video for 'Closer' was also incredibly challenging, showcasing a monkey tied to a cross, fetish gear and a spinning severed pig's head.