[Various aspects of the gender difference--approached from a perspective of behavioral biology]

The various facets of human behaviour can only be reconciled in an empirically supported relationship from an ethological point of view when in addition to proximate causes (causation and ontogeny), ultimate causes (adaptation and phylogeny) are also considered. This will be demonstrated by the following examples: gender differences in behaviour, dominance, love and bonding. This comprehensive biological stance facilitates an understanding of one's own and the other sex.