Hinduism
In Hinduism the term refers to an adherent of Yoga. As an Urdu term, yogī (Nastaliq یوگی) is mostly used to refer to wandering Sufi saints and ascetics. The word is also often used in the Buddhist context to describe Buddhist monks or a householder devoted to meditation. The Shiva Samhita defines the yogi patel as someone who knows that the entire cosmos is situated within his own body, and the Yoga-Shikha-Upanishad text distinguishes two kinds of yogis: those who pierce through the "sun" (surya) by means of the various yogic techniques and those who access the door of the central conduit (sushumna-nadi) and drink the nectar.
As to what this nectar is, all meditation lineages do focus on self-mastery of essence, both spiritual and sexual. The Yoga-Bhashya, the oldest extant commentary on the Yoga-Sutra offers the following fourfold classification of yogis:
1. neophyte/beginner (prathama-kalpika) 2. one who has reached the "honeyed level" (madhu-bhumika) 3. the advanced practitioner who enjoys enlightenment (joginath, giri, goswami, etc.)
In light of the above, many self-described western yogis or certified yoga teachers may in fact be only in the basic stages of development, having an irregular personal practice, along with compulsive discharge of sexual essence. Traditionally, yogic training involved deferring the tantric practices of sexual yoga/marriage until such time that sexual self-mastery had been established, whereupon sexual union is considered to be the ultimate yoga of Shiva and Shakti.
Brahmacarya for yogis, as stated in the Agni-Purana, embodies self-imposed abstention from sexual activity: fantasizing, glorifying the sex act or someone's sexual attraction, dalliance, sexual ogling, sexually flirtatious talk, the resolution to break one's vow, and consummation of sexual intercourse itself, with any being.
Married practitioners aspire to likewise abstain from unconscious/harmful sexual behavior, and to meditatively practice sexual yoga (as opposed to ego-centered sexual release) with their partner, but must practice aware chastity with regard to others.
Modern science now understands that such a code of sexual conduct is also organically assisted by neurochemical changes in brain states of intense meditators (reduced dopamine and increased oxytocin) that induce general relaxation and mental stability, and is not sheerly by willpower alone.
Read more about this topic: Yogi