What does Hinduism say about masturbation?
A glass can be looked on as half empty or half full. I think it is best to rephrase this question by asking instead - What does Hinduism say about continence (self constraint in sexual matters)?
Swami Nikhilananda in his writings on Hindu ethics says:
Besides the objective duties based on the castes and stages of life, there are laid down the common duties of men, the sadharanadharma, which are the foundation of the moral life. Manu, the lawgiver, enumerates these common duties as follows: steadfastness (dhairya), forgiveness (kshama), good conduct (dama), avoidance of theft (chauryabhava), control of the senses (indriyanigraha), wisdom (dhi), learning (vidya), truthfulness (satya) and absense of anger (akrodha)...the aim of Hindu ethics is to enable a man ultimately to conquer his lower self and attain freedom from passion, desire, and attachment.
All Hindu philosophers regardless of their conceptions of the supreme end of man, admit the empirical reality of the individual, endowed with volition, desire, will, conscience or consciousness of duty, emotion, etc. The goal of Hindu ethics is to train these faculties in such a way that they shall lead the individual to the realization of Moksha, or Liberation. Therefore all the schools of philosophy have described the virtues and their opposites in detail. It is expected of the moral agent that he should follow the former and shun the latter. We propose to discuss the virtues and their opposites according to the classification of Nyaya and of Patanjali's system.
Vatsyayana, in his commentary on the Nyaya aphorisms, classifies will as impious (papatmika) and auspicious (subha). The impious will leads to unrighteousness (adharma), and the auspicious will, to righteousness (dharma). Righteousness, it is necessary to add, is conductive to the Highest Good, whereas unrighteousness produces evil. The purpose of ethics is to subdue the impious and to manifest the righteous will."
Unrighteousness may take three forms, namely, physical, verbal, and mental, depending upon the condition of its functioning. Physical unrighteousness manifests itself as cruelty (himsa), theft (steya), and sexual perversion (pratisiddha maithuna); verbal unrighteousness, as falsehood (mithya), rudeness (katukti), insinuation (suchana), and gossip (asambaddha); mental unrighteousness, as ill-will (paradroha), covetousness (paradravyabhipsa), and irreverance (nastikya)."
Patanjali...describes the virtues that must be cultivated...chastity or continence...
The practice of continence, highly extolled by all the philosophers and mystics of India, implies, besides the literal meaning of the vow, abstention from lewdness in thought, speech, and action through any of the sense-organs. Through the practice of this virtue, one develops the capacity for subtle spiritual perception.
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