This book - about marriage behavior of man as a biological kind, or sex. Us all are attracted by this object, and nevertheless we have a clear idea about his origin. Which is biological sense that we have sex, although we rarer than all do it for continuation of family? Why do we enter into marriage, although marriage guarantees sex less all? Why do we fall in love in certain people? How really men think oh sex more often, than women? True, that do women search solvent men capable materially to provide their posterity unconsciously?In the eccentric research the known scientist-anthropologist studies the great number of the questions related to the infinitely enigmatic process of formation of pairs in human society. But as our kind is explained not only by biological impulses, an author examines sex also and from a point sight of our culture.