The role of Sex has been very interesting in the evolution ... I think it might have acted as a Gas Paddle for Human Consciousness to increase the rate of Understanding...
This might have triggered the Non-Linearity in the Evolution.
One day it all became clearer because of Sex.(and Love ofcourse)

Infact even today it acts as an accelerator of human growth.Therefore Sex Management is central to any Model of Human Development(Development as understood by Western thought.)
Issues like Rape , Prostitution and Marriages must be understood properly....
The so called crime and success stories both begin with a desrie of Sex with someone.
In my Country Saints say no to Sex and any associated prosperity because their Development Model is different..
And there are also some fanatics who understand nothing and claim to own the morality of Sex which condemns Women.