To further play upon the promise that Hai Karate would convert you into a bonafide chick magnet, they included self defense booklets with their products, on how to keep women off of you! Young men and older men alike obviously ate up the advertising, which made this cologne pretty popular in the 1960s, all the way up to the 1980s.
Here's a couple old Hai Karate commercials for your viewing pleasure..
Wonder if I could buy an old unopened bottle on ebay?
Yup, just as I expected! Although the price for a vintage bottle is a wee bit more than I'm willing to pay.