The 6th World Festival of Youth and Students had opened many eyes and ears in the Soviet Union. Many new social trends stemmed from that festival. Many Russian women became involved in love affairs with men visiting from all over the world, what resulted in the so-called "inter-baby boom" in Moscow and Leningrad. The festival also brought new styles and fashions that caused further spread of youth subculture called "stilyagi". The festival also "revolutionized" the underground currency trade and boosted the black market.