Most developments of scientific nature have come from men/the occasional woman, who were well off and educated, which has been a tiny fraction of humanity. You cannot prove a negative one way or the other.
In one he makes an assertion, supported by zilch facts, in the other just tries and fails to be witty.
Birth control has existed for thousands of years, some of the earliest medical treasties deal with it. Modern birth control is reliable in the sense it works, is easy to use, safe and well-understood mechanism of action. Earlier methods of birth control, often did work, but rarely were safe or easy to use, and the mechanism of action was rarely understood as well. Yet we know people used it, from all walks of life, the Romans basically caused silphium to go extinct because of its touted properties as a contraceptive (or in modern usage a morning after pill).
The second bit that you states, really displays your ignorance and sounds like something out of a UKIP propaganda leaflet. Fertility rates are dropping all over the world and the fall in developing countries (aka the “Third World”) is extremely marked
Bangladesh: 2.19.
India has a lower fertility rate in its cities than most developed countries.
Indonesia fertility rate: 2.13
Iran fertility rate:1.92