I suggest you try a dictionary of slang. Actually look at a couple since
there is variation, but I believe it is quite old. (Why does each generation
seem to think it is the first to discover sexual behavior?) I first learned
of the term in the early 1960s when I was in Job's Daughters, I was assigned
robe number 69, and it elicited snickering responses, so I learned what it
meant. (You have to know the organization and robe for the full impact.) I
also graduated from college in 69, when there was probably a revival of the
use of the expression.
Cheryl Thurber
chethur@aol.com
[2]
Don't forget that the graphic for the astrological sign of Cancer looks
like a "69."
Elizabeth Manny
em@laplaza.taos.nm.us