Blondes have more puns
Hmmmm. Do I detect a bit of innuendo here?
Of course, what else would you expect from the company that introduced the first one-step home hair-color formula five years earlier with this memorable teaser:
The 1969 ad at top, for a coloring formula with deceptive but irresistible name, "Born Blonde," foregoes that coy innuendo of an earlier era for a more leering come-on befitting the late-'60s sexual revolution (complete with the faux-psychedelic typeface of the free-love generation). As Wikipedia explains,
"In contemporary popular culture, it is often stereotyped that men find blonde women more attractive... Anita Loos popularized this idea in her 1925 novel, "Gentlemen Prefer Blondes."
(And of course, it helps when the film adaptation of said novel starred Marilyn Monroe.)
Clairol took that idea of the special appeal, and really ran with it, with headlines like "If I have only one life, let me live it as a blonde." and this one, which, later switched to a declarative sentence, remains embedded in our popular culture: "Is it true blondes have more fun?"