Salon, of all places, has re-published a 1939 article by Mahatma Ghandi about the evils of contraception and of “wasting seed”.

Here it is.  The boldface is mine, as are the comments in red.

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It is the fashion in some quarters nowadays for the young to discredit whatever may be said by old people. I am not prepared to say that there is absolutely no justification for this belief. But I warn the youth of all the countries against always discounting whatever old men or women may say for the mere fact that it is said by such persons.
Even as wisdom often comes from the mouths of babes, so does it often come from the mouths of old people. The golden rule is to test everything in the light of reason and experience, no matter from whom it comes.
I want to discuss the subject of birth control by contraceptives. It is dinned into one’s ears that gratification of the sex urge is a solemn obligations, like the obligation of discharging debts lawfully incurred, and that not to do so would involve the penalty of intellectual decay. This sex urge has been isolated from the desire for progeny, and it is said by protagonists of the use of contraceptives that conception is an accident to be prevented except when the parties desire to have children.
I venture to suggest that this is a most dangerous doctrine to preach anywhere, much more so in a country like India, where the middle-class male population has become imbecile through abuse of the creative function.  This is an old fashioned way of saying that if you spend all your time on self-indulgent non-productive activities like contraceptive sex or masturbation, the character it breeds in you will be nothing short of mentally deficient.  No, it won’t “make you go blind” except morally and spiritually blind.
If satisfaction of the sex urge is a duty, unnatural vice would be commendable. This follows as the night the day.  “Gay marriage” then becomes imposed on your society and your church, whether you want it or not. Even persons of note have been known to approve of what is commonly known as sexual perversion. The reader may be shocked at that statement. But if it somehow or other gains the stamp of respectability, it will be the rage among boys and girls to satisfy their urge among members of their own sex.  I am told that the peculiar phrase pan-sexual is all the rage among the pierced and spiked who work at Subway (i.e., the kids of your wealthy suburban neighbors), and for twenty years now, a young woman just ain’t with it if she hasn’t had a Lesbian encounter or two.
To me the use of contraceptives is not far removed from the means to which persons have hitherto resorted for the gratification of their sexual desire with the results that very few know. And I betray no confidence when I inform the reader that there are unmarried girls of impressionable age in schools and colleges who study birth-control literature and magazines with avidity and even possess contraceptives.
It is impossible to confine their use to married women.  Apparently this was the argument being used for contraception.  Compare the arguments, “Abortion will be used only for hard cases” or “Divorce if there’s no other alternative” or “Let’s get a cell phone and only use it for emergencies.
Marriage loses its sanctity when its purpose and highest use is conceived to be the satisfaction of the animal passion without contemplating the natural result of such satisfaction. I have no doubt that those learned men and women who are carrying on propaganda with missionary zeal in favor of their use of contraceptives are doing irreparable harm to the youth of the world under the false belief that they will be thereby the poor women who may be obliged to bear children against their will. Those who need not limit their children will not be easily reached by them.
Our poor Indian women have not the knowledge or training that the women of the West have. Surely the propaganda is not being carried on in behalf of the middle-class women, for they do not need the knowledge, at any rate, so much as the poorer classes do.
The greatest harm, however, done by the propaganda lies in its rejection of the old ideal and substitution in its place of one which, if carried out, must spell the moral and physical extinction of the race.  “The moral and physical extinction of the race” – see the demographic crisis that threatens Russia, China and the West and the moral crisis that gnaws even deeper.
The horror with which ancient literature has regarded the fruitless use of the vital fluid was not a superstition born of ignorance. What shall we say of a husbandman who will sow the finest seed in his possession on a stony ground, or of the owner of a field who will receive in his field rich with fine soil good seed under conditions that will make it impossible for it to grow?  In the Culture of Sterility, we say, “Well done, good and faithful servant, to waste your potential and destroy our future.”  
God has blessed man with seed that has the highest potency and women with a field richer than the richest earth to be found anywhere on this globe. Surely it is criminal folly for man to allow his most precious possession to run to waste. And so is a woman guilty of criminal folly who will receive the seed in her life-producing field with the deliberate intention of letting it run to waste. Both he and she will be judged guilty of misuse of the talents given to them and they will be dispossessed of what they have been given.
Sex urge is a fine and noble thing. There is nothing to be ashamed of in it. But it is meant only for the act of creation. Any other use of it is a sin against God and humanity.  Westians, listen up!
It was reserved for our generation to glorify vice by calling it virtue. Woe unto them that call evil good, and good evil; that put darkness for light, and light for darkness; that put bitter for sweet, and sweet for bitter! (Is. 5:20).  The greatest disservice protagonists of contraceptives are rendering to the youth of today is to fill their minds with what appears to me to be wrong ideology.
Let the young men and women who hold their destiny in their hands beware of this false god and guard the treasure with which God has blessed them and use it, if they wish, for the only purpose for which it is intended.