I think the Church would dissuade married couples from enjoying marital relations, if the couple would want to avoid having offspring permanently.
Procreation thus remains a natural result of marital relations between man and wife, the inability of a couple to have children is another thing altogether , since they desire children but the Lord in his wisdom has not given them that particular joy.
Since a childless couple are not barred from their conjugal rights , one can thus see that marital relations have their rightful place within the marriage bond (regardless of whether procreation is involved) .
Regarding contraception, I think for better or for worse , some variation in emphasis will occur from country to country. In India, contraception is encouraged at every level by the state and the medical fraternity.
It is true that a huge population does gravely stress resources.
The Church's position is that abortion and abortive methods of contraception are to be avoided. Regarding barriers of all sorts, I think it is better to speak to a spiritual confessor. If you are married, you are to discuss with your spouse as well.
As someone who is married, let me just say that I see some merit in the RC argument against condoms. Of course such things have to balanced against the needs of the family as well.