Risk sexual behaviour is traditionally understood as behaviour leading to unwanted pregnancy and to spread of STD. Prevention consists, besides education towards responsibility, also in availability of reliable contraception. But most highly developed countries face further problems today - declining birth rate and increasing number of persons demanding treatment of infertility.

Qualitative analysis of outputs of studies from different branches (demographic, medical, psychological, sociological).

The decisions to become parents are postponed to higher ages, bringing the problem of age-related infertility and constituting significant health, psychological, social, ethical, legal and economic problems. Studies mapping the information level of people show underestimation of biological limits, overestimation of possibilities of assisted reproduction and underestimation of the significance of male fertility disorders. Media inform about the problem particularly in connection with declining birth rate, which is a context that can be perceived by people rather as inadmissible pressure on “production of children”. Individual health and psycho-social risks stay completely unnoticed.

Modern era brings us ironically to label even responsible (? ) postponing of parenthood to the time of (expected) higher personality maturity and economic stability as risk behaviour. But this problem has been so far only marginal for concepts of sexual education and family planning. Europe spends huge sums of money on treatment of infertility, there are large projects for family support, but they deal minimally with prevention. Interdisciplinary cooperation in this sphere is a must.