113-0033 7-3-1 genda@iss.u-tokyo.ac.jp Divided Youth Employment and Sexual Behavior 2006 4 General Social Survey JGSS 20 34 JGSS 1 2002 General Social Survey (JGSS) JGSS JGSS 2002 JGSS 2000 2001 4 JGSS 2 2 2005 OECD 24 1970 1990 250 60 30 34 1992 25 2002 33 20 24 1992 6 2002 12 90 2005 1) 21 2004 11 2002 10 2003 2004 16 1992 101 2005 217 2004 15 34 3 1992 131 2002 213 2005 12 20 59 800 ( ) 2) 35.5