There’s something very misogynistic about the story here. There was a famous singer with a great voice who didn’t want to tell people what the secret was. This story (and this page in particular) posits that the secret had to do with her willingness to perform fellatio. From there, the story spins into the man jealously killing other men who claim to have knowledge of the secret. It’s not a great story, to be honest.

(Heavy Metal issue #167, March 1997 – Page 87 Juanita’s Secret by Carulla and Sampayo)