In the Buddha's first discourse he identifies craving (tanha) as the cause of suffering (dukkha). He then identifies three objects of craving: the craving for existence; the craving for non-existence and the craving for sense pleasures (kama). Kama is identified as one of five hindrances to the attainment of jhana according to the Buddha's teaching. Throughout the Sutta Pitaka the Buddha often compares sexual pleasure to arrows or darts. So in the Kama Sutta from the Sutta Nipata the Buddha explains that craving sexual pleasure is a cause of suffering.
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If one, longing for sexual pleasure, achieves it, yes, he's enraptured at heart. The mortal gets what he wants. But if for that person — longing, desiring — the pleasures diminish, he's shattered, as if shot with an arrow.
The Buddha then goes on to say:
So one, always mindful, should avoid sexual desires. Letting them go, he will cross over the flood like one who, having bailed out the boat, has reached the far shore.
The 'flood' refers to the deluge of human suffering. The 'far shore' is nibbana, a state in which there is no sexual desire.
The meaning of the Kama Sutta is that sexual desire, like any habitual sense pleasure, brings suffering. To lay people the Buddha advised that they should at least avoid sexual misconduct which meant following generally accepted norms of sexual morality and behavior. From the Buddha's full-time disciples, the ordained monks and nuns, strict celibacy (called brahmacarya) has always been required.
Overview
Former Vice President of the Buddhist Society and Chairman of the English Sangha Trust, Maurice Walshe, wrote an essay called 'Buddhism and Sex' in which he presented Buddha's essential teaching on human sexuality and its relationship to the goal (nibbana). The third of the five precepts states:
The literal meaning of this statement is, "I undertake the course of training in refraining from wrong-doing in respect of sensuality." Walshe comments,
The Buddha's teaching arises out of a wish for others to be free from dukkha. According to the doctrine he taught, freedom from suffering involves freedom from sexual desires and the training (Pali: sikkha) to get rid of the craving involves to a great extent abstaining from those desires. This is based on the understanding that indulging in such desires perpetuates the underlying craving.
Celibacy and monasticism
Apart from certain schools in Japan and Tibet, most who choose to practice Buddhism as ordained monks and nuns, also choose to live in celibacy.
Sex is seen as a serious monastic transgression. Within Theravada Buddhism there are four principal transgressions which entail expulsion from the monastic Sangha: sex, theft, murder, and falsely boasting of superhuman perfections. Sexual misconduct for monks and nuns includes masturbation. In the case of monasticism, abstaining completely from sex is seen as a necessity in order to reach enlightenment. The Buddha's criticism of a monk who broke his celibate vows—without having disrobed first—is as follows:
"'Worthless man, [sexual intercourse] is unseemly, out of line, unsuitable, and unworthy of a contemplative; improper and not to be done... Haven't I taught the Dhamma in many ways for the sake of dispassion and not for passion; for unfettering and not for fettering; for freedom from clinging and not for clinging? Yet here, while I have taught the Dhamma for dispassion, you set your heart on passion; while I have taught the Dhamma for unfettering, you set your heart on being fettered; while I have taught the Dhamma for freedom from clinging, you set your heart on clinging."
"'Worthless man, haven't I taught the Dhamma in many ways for the fading of passion, the sobering of intoxication, the subduing of thirst, the destruction of attachment, the severing of the round, the ending of craving, dispassion, cessation, unbinding? Haven't I in many ways advocated abandoning sensual pleasures, comprehending sensual perceptions, subduing sensual thirst, destroying sensual thoughts, calming sensual fevers? Worthless man, it would be better that your penis be stuck into the mouth of a poisonous snake than into a woman's vagina. It would be better that your penis be stuck into the mouth of a black viper than into a woman's vagina. It would be better that your penis be stuck into a pit of burning embers, blazing and glowing, than into a woman's vagina. Why is that? For that reason you would undergo death or death-like suffering, but you would not on that account, at the break-up of the body, after death, fall into deprivation, the bad destination, the abyss, hell..."
"'Worthless man, this neither inspires faith in the faithless nor increases the faithful. Rather, it inspires lack of faith in the faithless and wavering in some of the faithful.'"
Lay Buddhism
The most common formulation of Buddhist ethics are the Five Precepts and the Eightfold Path, which say that one should neither be attached to nor crave sensual pleasure. These precepts take the form of voluntary, personal undertakings, not divine mandate or instruction. The third of the Five Precepts is "To refrain from committing sexual misconduct.
Fornication, or sex outside of marriage, is seen as a violation of the Brahmacharya vow from the Five Precepts.
According to the Theravada traditions there are some statements attributed to Gautama Buddha on the nature of sexual misconduct. In Everyman's Ethics, a collection of four specific suttas compiled and translated by Narada Thera, it is said that adultery is one of four evils the wise will never praise. Within the Anguttara Nikaya on his teachings to Cunda the Silversmith this scope of misconduct is described:
"...one has intercourse with those under the protection of father, mother, brother, sister, relatives or clan, or of their religious community; or with those promised to someone else, protected by law, and even with those betrothed with a garland"
This and other teachings within the Pali Canon are important and fundamental guidance for Theravada Buddhists.
Sexual Yoga
According to some Tibetan authorities, the physical practice of sexual yoga is necessary at the highest level for the attainment of Buddhahood. The use of sexual yoga is highly regulated. It is only permitted after years of training. The physical practice of sexual yoga is and has historically been extremely rare. A great majority of Tibetans believe that the only proper practice of tantric texts is metaphorically, not physically, in rituals and during meditative visualizations. The dominant Gelug sect of Tibetan Buddhism holds that sexual yoga as an actual physical practice is the only way to attain Buddhahood in one lifetime. The founder of the sect Tsongkhapa did not, according to tradition, engage in this practice, but instead attained complete enlightenment at the moment of death, that being according to this school the nearest possible without sexual yoga. The school also taught that they are only appropriate for the most elite practitioners, who had directly realized emptiness and who had unusually strong compassion. The next largest school in Tibet, the Nyingma, holds that this is not necessary to achieve Buddhahood in one lifetime. The fourteenth Dalai Lama of the Gelug sect, holds that the practice should only be done as a visualization.
Homosexuality
Among Buddhists there is a wide diversity of opinion about homosexuality. Buddhism teaches that sensual enjoyment and desire in general, and sexual pleasure in particular, are hindrances to enlightenment, and inferior to the kinds of pleasure (see, e.g. pīti, a Pāli word often translated as "rapture") that are integral to the practice of jhāna.
The Five Precepts of the "Sexual misconduct" is a broad term, subject to interpretation according to followers' social norms. Early Buddhism appears to have been silent regarding homosexual relations. Still, Some Buddhists of Asian background hold prejudices against gay/lesbian or transgender persons, despite no saying that same or opposite gender relations have anything to do with sexual misconduct in the Early Buddhist scriptures and many later Buddhist texts.
According to the Pāli Canon & Āgama (the Early Buddhist scriptures), there is no any saying that same or opposite gender relations have anything to do with sexual misconduct, and some Theravada monks express that same-gender relations do not violate the rule to avoid sexual misconduct, which means not having sex with someone underage (thus protected by their parents or guardians), someone betrothed or married and who have taken vows of religious celibacy.
Some later traditions feature restrictions on non-vagina sex, though its situations seem involving coerced sex. This non-vagina sex view is not based on what Buddha's said, but from some later Abhidharma texts.
Conservative Buddhist leaders like Chan master Hsuan Hua have spoken against the act of homosexuality. Some Tibet Buddhist leaders like the 14th Dalai Lama spoke about the restrictions of how to use your sex organ to insert other's body parts based on Je Tsongkhapa's work. Though the Dalai Lama expressed “the possibility of understanding these precepts in the context of time, culture and society", he doesn't seem to change his view about what constitutes "sexual misconduct" after that. the Dalai Lama called for further research and dialogue on this topic, "and concluded by reiterating the fact that, however the notion of sexual misconduct comes to be defined, it can never be used to justify discrimination against sexual minorities."
Other prominent Buddhists diverge from this position. The Bhutanese lama Dzongsar Khyentse Rinpoche has argued that sexual orientation is irrelevant to Buddhist concerns about sexuality, explaining that culture is to blame for homophobia.
The situation is different for monastics. For them, the Vinaya (code of monastic discipline) bans all sexual activity, but does so in purely physiological terms, making no moral distinctions among the many possible forms of intercourse.
Regarding transsexual people, the earliest texts mention the possibility of a person supernaturally changing sexes; such a person is not barred from ordination, and if already ordained, simply changes orders.
Western Buddhism
Western Buddhism is often relatively gay-friendly, often carrying these views prior to their conversion to Buddhism, and the interpretation of what is sexual misconduct is an individual decision and not subject to judgment by any central authority. A notion of accepting all peoples while rejecting certain types of sexual acts is more predominant.
When applying Buddhist philosophy to the question of homosexuality, Western Buddhists often emphasize the importance the Buddha placed on tolerance, compassion, and seeking answers within one's mind.