Bonobos

Through reading an article about the sexual behaviors of the Bonobo Monkey, it became more apparent to me that humans' sexual behavior is greatly influenced by emotion and cultural norms.  The Bonobo live an egalitarian lifestyle that promotes the female dominance and kinship that is important in later life... and these are the only primates whose female population engages in such behavior.  Engaging in sexual behavior amongst same sex Bonobo is not uncommon, as well as different sexual positions akin to "missionary" in humans.  If humans and apes are close relatives and this behavior is not a) looked down upon, and b) a frequent behavior in the Bonobo community, why is it looked down upon in our culture?  There seems to be a stead fast power hold that men, in general, are not willing to release.. not only with who "runs the house" but with human sexual norms... just a few thoughts...