The purpose of this study was to examine two theories before developing the couple
relationship improvement program based on evolutionary psychology and Bowen's theory.
First, on the basis of evolutionary psychology, this study examined sexual difference
about mating strategies, aggressiveness, and jealousy, which are important factors related
to human reproduction. Second, this study examined the effects of original family
experiences on individuals and couples, and considered that the improvement of
differentiation of self, a key concept of Bowen' theory, could have a positive impact on
couples.
In conclusion, this study of sexual differences based on evolutionary psychology and
consciousness of original family relationships based on Bowen' theory will be basic data
for the couple relationship improvement program.