EN
In this publication it is analyzed how premarital sex influences postponing a decision to marry and decision to have children. Basic reasons of postponing marriage are also presented. It is proved that premarital sex delays such a developmental task as selection of the spouse. It is explained that the decision to marry is influenced by the following factors resulting from premarital sex: cultural acceptance of sex outside marriage, trauma due to interruption of previous sexual relations. Longer period of fertility in case of men than women is also considered.