Karmaṇā daiva-netreṇa jantur deha upapattaye (SB 3.31.1). Jantu means living entities. For giving him a body, it is decided by the higher authorities. You cannot say, "Now give me the body of a king." Now you are American. You cannot say, you cannot dictate that, "Give me again the American body as the son of Rockefeller." No.
That will be judged, what you have done. Of course, you have got this opportunity for your pious activities. Because to take birth in rich family or a rich nation, that is due to pious activity, past. Janmaiśvarya-śruta-śrībhiḥ (SB 1.8.26). Janma, birth; aiśvarya, riches; śruta, education; and śrī, and beauty. These things are obtained according to past activities. Not that everyone becomes educated. No. There is no such chance.
That we were discussing this morning. There is no chance. Everything depends on some cause. Not that by chance anyone becomes very rich man. No. One has to work for it. Not that by chance one becomes very educated. These things are not chances. So as soon as there is no chance, there is cause, there must be judgment. There must be judgment. Otherwise why one man is born rich and other man is working so hard, but he is lying down on the street?
So there is judgment. So the small particle of the living entity, by the judgment, superior judgment, is transferred to the semina of a particular father. And the living entity is injected in the womb of the female, and both secretion combine, the living entity develops body. This is the science. If you use contraceptive, that means if you contaminate the emulsion, the poor living entity cannot take place. That is contra . . . you cannot kill the living soul, but you make the circumstances unfavorable for his staying, or . . . then he has to be transferred to another womb.