It has certainly spread to the younger civie population in tha past 10 years. Those of us who grew up as hippies are used to au naturale. I am guessing that most of our wives are that way. Nowadays a brazillian wax is as common in salons for women as is a pedicure.
Prostitutes have been shaving long before it became common in porn and it started as a matter of hygiene and prevention of crabs. Then the bikini created a need for the trimming and waxing and then it became "sexy" to go bare.