It does not follow because a woman has not given birth to a child that she has not conceived. The life of an infant for a long time after birth is a frail one, and before birth its existence is extremely precarious; it often perishes a few days after conception. A period coming on a few days late, and at the same time one which is unusually profuse, is the only evidence which the young wife may have of an abortion. Among prostitutes, the frequent delay of menstruation, then abundant hemorrhage, is in many cases only habitual abortion, and leads to changes in the generative organs which must result in sterility. A tendency to miscarriage may therefore be all that stands in the way of having a family; this can frequently be remedied.
Sexual incompatibility is well known to exist; prominent examples being Augustus and Livia; Napoleon and Josephine. It is also a well-known fact that frigidity is a cause of barrenness. A short separation of husband and wife is often salutary in its influence upon fertility.
It is a well-established fact that the time immediately before the period, but still more that immediately following the period, are the most favorable times for conception to take place; the remaining quiet in bed of the woman after the generative act is also favorable to conception.
The most frequent causes of sterility in women are inflammation of the lining membrane of the uterus, or of the neck of the uterus, or of both. The source of this condition in women who have had children is most frequently due to parturition or abortion. In the newly married it may be due to a previously existing slight uterine catarrh in a displaced uterus, or it may be a manifestation of a run-down state of the system. In a majority of the newly married, however, the inflammation of the endometrium is probably due to the first efforts at conjugal approach. Many young women as the result of the preparation of the trosseau, augmented by a round of gaities at the time of marriage, enter the married state in a condition bordering on physical and nervous exhaustion; and then begin engorgements and inflammations which lead to future suffering and to sterility. Displacements and flexions of the uterus also cause sterility. Such displacements of the neck of the uterus may occur that, instead of lying in a pool of semen, as it should, it is above, in front of, or away from it, and this may prevent conception.
Vulvar and vaginal hyperesthesia, inflammations of the vulva, undue shortness of the vagina, unless great care is exercised by the husband, will induce painful coitus, and may bring about sterility by favoring the formation of a copulation sac outside of the axis of the uterine canal, and consequently misdirection of the semen.
Scrofula, probably by its effects on the general condition, leading to deficient development of the whole body, the genital organs included, may be productive of sterility.
The female being less passionate than the male, the orgasm comes on later with her, or the male orgasm occurs so soon that she may not reach that stage at all. If both were simultaneous, it is reasonable to suppose that conception would be more likely to occur.
Ovulation is doubtless more frequently performed in some women than in others. Some women conceive with more or less regularity every fifteen or eighteen months, and others at intervals of several years.
The effect of repeated coition, provided that impregnation does not take place at once, is to engorge the uterine vessels, to alter the nature of the glandular secretions, to cause profound reflex disturbances, and thus to produce such changes in the endometrium as to lead to local inflammation and to general nervous exhaustion. Backache, leucorrhea, and irritable bladder are the first symptoms of this disorder; but frequently there are added to these, headache, indigestion, rectal tenesmus, painful and profuse menstruation. In many cases the disease continues in a mild catarrhal form, giving the woman little inconvenience besides the slight leucorrheal discharge which stains her clothing; but often this is indicative of such a change of the lining membrane of the uterus as to render it unfit for the fixation and development of the ovum, even should impregnation take place.
Under normal conditions, during the intermenstrual period, a plug of clear viscid mucus, which is secreted by the glands of the cervical canal, blocks up that passage, but is washed away each month by the menstrual discharge. Under ordinary conditions this obstruction must seriously interfere with the entrance of the spermatozoa into the cavity of the uterus, and renders the former theory, recently revived by Bossi, quite tenable, that impregnation is most likely to occur just after the menstrual epoch.