I have no need at this time in my life for birth control, so this has no personal application to me  :-)!
However, what you are saying is that poor women, who must daily decide how they will have enough money for food and clothing and rent are to have no sex at all with their husbands.  That is an interesting proposition.  And how are the husbands then to deal with the "primal urges" about which you write in response to another poster?  Anything that you might propose has been declared sinful by the Church.