Someone actually released a press release with:
"SEX IS MAIN CAUSE OF POPULATION GROWTH "

http://www.optimumpopulation.org/rel...ase26Mar09.htm

Conventional economic wisdom, which says that couples in poorer societies actively plan to have large families to compensate for high child mortality, to provide labour, and to care for parents in their old age, is wrong, Professor John Guillebaud will tell a conference on sustainable population today.

Economists overlook the fact that sexual intercourse is more frequent than the minimum needed for intentional conceptions, and that half of pregnancies worldwide are unplanned. Moreover, demand for contraception increases when it is available, irrespective of a society’s wealth or child survival rates.