I have no facts or figures to back up what I’m about to say, so consider it idle speculation.
I would propose that the drug problem went from the cities to the country. Drugs are piped into where the largest markets are, and distributed outward. Furthermore, the social networks kept some of it down historically. But country bumpkin kids always want to try what the city slicker kids are doing, especially when the media is glamorizing it.
Promiscuity might have gone the other direction. It seems like people have traditionally married younger in the country. As the other poster said, country kids make their own fun.
THe above statements leave out an awful lot of influences, I realize.
The problem in our neck of the woods is the city kids that got kicked out of school and sent to live with Grandma or some other relative in the country, then attend our schools, but still have their "connections" in the city.