Without the sex act, no babies could be created, for it is by this means only that the semen which contains the male part of the germ of life can meet the ovum or the female part of the germ of life. When the two parts come together in the woman's body under just the right conditions, a baby begins to grow--at first so tiny that it could hardly be seen without a microscope, and finally, after nine months' growth in the uterus or womb of the mother till it weighs about seven or eight pounds, it is born, a live human being. The birth process is called _labor_, and it is indeed labor, for it usually means much pain and struggle for the mother, although the baby's journey from the uterus to the world is only a few inches. It takes anywhere from an hour to two days for a baby to be born. Doctors are learning more and more how to lessen the pain, and by the end of another generation it ought to be possible for child-birth to be practically painless for most women. By that time people will more generally understand how to have babies _only_ when they want them and can afford them. At present, unfortunately, it is against the law to give people information as to how to manage their sex relations so that no baby will be created unless the father and mother are ready and glad to have it happen. Now you must understand something about this intricate sexual machinery. Plate I shows the woman's organs and Plate 2 the man's. Both these illustrations are sections, as if the body were cut in two vertically. [Illustration: *Plate One*] 1. Backbone. 2. Rectum, which carries away the solid waste matter from the bowels. 3. Anus, the opening of the rectum. 4. Bladder, which holds the waste water or urine. 5. Ovary, in which grows the ovum or egg. 6. Fallopian tube, which carries the ovum to the uterus. 7. Uterus or Womb, in which the egg or ovum grows into a baby. 8. Mouth of the Uterus, through which the semen has to go to meet the ovum. 9. Vagina or Birth Canal, into which the penis fits during the sex act. 10. Entrance to the Vagina. 11. Entrance to the Urethra, which carries away the waste water or urine. [Illustration: *Plate Two*] 1. Backbone. 2. Rectum, which carries away the solid waste matter from the bowels. 3. Anus, the opening of the rectum. 4. Bladder, which holds the waste water or urine. 5. Penis, which fits into the vagina, during the sex act. 6. Prepuce, or fore-skin. 7. Scrotum, the bag which holds the testicles. 8. Testicles, in which grow the spermatozoa, or germs of life. 9. Vas Deferens, which carries the spermatozoa to the urethra. 10. Prostate Gland. 11. Seminal Vesicle. Both 10 and 11 secrete liquids that make part of the semen, and which nourish the spermatozoa. 12. Urethra, which carries the spermatozoa, also the urine. 13. Cowper's Gland, which secretes a liquid which makes the urethra alkaline. 14. One of the spermatozoa, or germs of life, much magnified.