It is for the husband to decide whether or not he believes that his family should be limited (for serious reasons like poverty etc) and he is perfectly entitled to abstain if he believes this to be the case.
If his wife wishes for sɛҳuąƖ intercourse because she desires more children that is perfectly morally acceptable, but she must accept her husband's wishes as head of the family and provider.
For a woman to wish her husband to 'honour the debt' purely and simply because she has a 'high sex drive' is in my view (as a woman) wholly unacceptable and demonstrates an un-natural, un-feminine and un-chaste mindset, rooted in sin and lust.