Here is a presented fact by a physician:

The sexual function is for the purpose of producing new individuals to take the place of those who die, and thus preserve the species from becoming extinct.
In the animal kingdom generally the reproductive function is necessarily a periodical act, dependent upon the development of the reproductive organs of both the male and the female at stated periods.
In those exceptional cases in which the organs of the male are in a state of constant development, sexual congress occurs, in lower animals, only at those periods when the periodical development occurs in the female.
Fecundation of the female element can only take place about the time of periodical development in the female.
The desire for sexual congress naturally exists in the female only at or immediately after the time of periodical development.
The constant development of the sexual organs in human males is a condition common to all animals in which development occurs in the female at short intervals, and is a provision of nature to secure a fruitful union when the female is in readiness, but not an indication for constant or frequent use.
The time of sexual congress is always determined by the condition and desires of the female.
An additional fact, as stated physiologists, is that, under normal conditions, the human female experiences sexual desire immediately after menstruation more than at any other time. It has, indeed, been claimed that at this period only does she experience the true sexual instinct unless it is abnormally excited by disease or otherwise.

The conclusion facts drawn from the above facts are the following:

The fact that in all animals but the man species, the act can be performed only when reproduction is possible, proves that in the animal kingdom in general the sole object of the function is reproduction. Whether man is an exception must be determined from other considerations.
The fact that the males of other animals besides man in which the sexual organs are in a state of constant development do not exercise those organs except for the purpose of reproduction, is a proof of the position that the constant development in man is not a warrant for their constant use.
The general law that the reproductive act is performed only when desired by the female, is sufficient ground for supposing that such should be the case with the human species also.
It is incredible the act of bringing men into life, the act of humanity, without contradiction of the most importance, should be the one of which there should have been the least supposed necessity for regulation or which has been regulated the least beneficially.
The very lively solicitations which spring from the genital sense, have no other end than to insure the perpetuality of the race.
He is an ill-husband that uses his wife as a man treats a harlot, having no other end but pleasure. It is a sad truth that many married people, thinking that the flood-gates of liberty are set wide open, without measures or restraints, have felt the final rewards of intemperance and lust by their unlawful using of lawful permissions.
It is a common belief that a man and woman, because they are legally united in marriage, are privileged to the unbridled exercises of amativeness. This is wrong. Nature, in the exercise of her laws, recognizes no human enactments, and is prompt to punish any infringement of her laws, in those who are legally married, as in those out of bonds. Excessive sexual indulgence between the married produces as great and lasting evil effects as in the single man or woman, and is nothing more or less than legalized prostitution.
The effects upon the husbands – The principal blame in the matter properly falls upon the husband, but it cannot be said that he is the greatest sufferer, however, his punishment is severe enough to clearly indicate the enormity of the transgression and to warn him to reformation of his habits.
The married man who who thinks that because he is a married man, he can be indulge in the act as long as he want, will suffer as certainly and as seriously as the unmarried debauchee who acts on the same principle in his indulgences, perhaps more certainly from his very ignorance, and from his not taking those precautions and following those rules which a career of vice is apt to teach the sensualist.
Married people often appear to think that the connection may be repeated as regularly and almost as often as their meals. Till they are told of the danger, the idea never enters their heads that they are guilty of great and almost criminal excess.
Some people go as far as to believe that indulgence may increase their powers, just as gymnastic exercises augment the force of the muscles. This is a popular error, and requires correction. Such patients should be told that the shock on the system each time connection is indulged in, is very powerful, and the expenditure of seminal fluid must be particularly injurious to organs previously debilitated. It is by this and similar excesses that premature old age and complaints of the generative organs are brought on.
It is not the body alone which suffers from the excesses committed in married life, but much of the languor of mind, confusion of ideas, and inability to control the thoughts, of which some of the married men complaints, arise from the cause.
The debilitating effects of excessive sexual indulgence arise from two causes; the loss of the seminal fluid, and the nervous excitement. The sperm is the purest extract of the blood. Nature, in creating it, has intended it not only to communicate life, but also to nourish the individual life. In fact, the re-absorption of the fecundating liquid impresses upon the entire economy, new energy, and manliness which contributes to the prolongation of life.
Nothing costs the economy so much as the production of semen and its forced ejaculation. It has been calculated that an ounce of semen was equivalent to forty ounces of blood. Semen is the essence of the whole individual.
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