Would suggest easily-available adult content might play a large role. Its existence blunts the hormonal challenges faced by young men. Cars used to be a way for

Would suggest easily-available adult content might play a large role. Its existence blunts the hormonal challenges faced by young men. Cars used to be a way for young couples to find privacy away from parents/guardians a la "Animal House," but in a world with substitute goods that's no longer as strong a requirement. Lack of cars also makes it harder for large groups of teens to congregate, a la "Dazed and Confused" and reduces the peer pressure effects that lead many to drink and smoke.