P0067a: attitude towards sex / sexual behaviour and satisfaction / information on sex / experiences in youth / premarital and extramarital sexual permissiveness / sexual freedom of boys versus girls / attitude towards masturbation, romantic love, naturalness / tolerance regarding sexual and semi- sexual expressions / sexual libertarianism versus traditionalism / attitude towards homosexuality / sexual education / the use of contraceptives. P0067b: sexual behaviour / experiences in work and at school / leisure activities with friends / relationship with parents / political interest / sexual information and education / premarital sexual permissiveness / attitude towards masturbation and romantic love / attitude towards homosexuality / use of contraceptives / sexual satisfaction and inhibitions / sexual libertarianism versus traditionalism / sexual attitude and behaviour. Background variables: basic characteristics/ residence/ household characteristics/ characteristics of parental family/household/ occupation/employment/ income/capital assets/ education/ social class/ politics/ religion/ consumption of durables/ organizational membership