Re: Man,70, marries 15 year old, then complains to police when she leaves.
I would say the latter is odd and slightly disturbing, but I wouldn't call it immoral.
Selling your child to be the sexual slave of another person is incredibly immoral.
Seriously, not even comparable. Society would never allow the latter in the US.
When things go wrong, I sing along...it is the nature of the business...