Song of the Day 3/11: AC/DC, “Hard as a Rock”

Can someone please explain why Viagra hasn’t used this as their theme song? The Young brothers didn’t even bother to disguise it a double entendre — it’s crystal clear what Brian Johnson is singing about. In case there was any doubt, the B-side to the single was “Caught With Your Pants Down.”

“Hard as a Rock” was released in 1995, as the lead single from the band’s “Ballbreaker” album, though it was written almost 10 years earlier, for the 1986 film “Maximum Overdrive.” That’s a long time to stay hard as a rock. Pfizer, are you listening?