Edit : upon reflection I should probably address ur issue of promiscuity - so long as people r safe and happy why does it matter?
Why?
Because it destroys the Family as the unit which builds sound and safe societies.
The whole issue of being "saved" is about this matter.
The surrounding enemies and thieves that look into a successful nation and would invade merely await the decay in the next generation of fatherless, criminal barbarian kids.
BUT,... worse, the Feminization that takes place once women are allowed to use sex as currency creates a weak matriarchy by degrees.
At some point, the matriarchy will fall either from excessive socuialism within, or thru the invasion of harsh patriarchies external to them, like N. Korea, China, Islam of today.