"Patriarchy" is but a palliative word that obscures and expresses the darker reality of "why". Even "misogyny" fails to explain; too easy to deny.

One can visualize the origins of feminine "subordination" in species male herding and female breeding fragility of pre- and neo-humanoid survivalism. 
One can also visualize the "Eve" expression at some point towards community peership and its brutal, testosterone driven "put-down"; its once and for all status-quo imposition & rationalization in "god-willness" and ritual "unclean-ness".

The destiny of humankind is to inject cooperative, benign and empathetic intelligence to creative evolution (aka civilization). It is not to reach back, appeal to "god" or even nature to justify, rationalize, preserve a contemporary form of herding, the irrational assumption of "male" dominion which enshrines "sex on demand".  (Maybe celibacy was the Spirit's ill-fated wind for the Jesus "called", "formed" & "freed" to lead beyond women as things?). Irony!