Karmamudrā (Sanskrit; "action seal," erroneously: kāmamudrā or "desire seal," Tib. las-kyi phyag-rgya) is a Vajrayana Buddhist technique of sexual practice with a physical or visualized consort. When the consort is a visualised one they are known as the jnanamudra.
Tantra uses skillful means to transform what could tie a practitioner to samsara into a spiritually liberative practice. Judith Simmer-Brown explains how karmamudra can be used to explore the nature of passion:
There are traditionally three ways to realise the nature of passion in the yogic tradition of Tantra. First in creation-phase practice one can visualise the yidams as yab-yum in sexual union... Second one can practice tummo (caṇḍalī) or the generation of internal heat through the subtle body practices of the vital breath moving into the central channel. Third, one can practice so-called sexual yoga (karmamudra, lekyi chagya) with a consort. Realising the true nature of passion in all of these forms transforms ordinary passion into the basis for the experience of great bliss (mahasukha), which greatly accelerates the removal of emotional and mental obscurations in one's practice.
Early masters of the Six Yogas of Naropa, placed great emphasis on karmamudra practice, with some giving it separate status as one of the six yogas whilst others saw it as an aspect of the inner heat yoga. This sadhana is a part of the Lamdre system of the Sakya school, the Kalachakra tantra central to the Gelug school and Anuyoga as practised by the Nyingma school.
According to most Tibetan Buddhist teachers, karmamudra is necessary in order to attain enlightenment in this lifetime. For example modern day Gelug teachers such as Thubten Yeshe have made statements supporting this view. However, some lamas disagree. For example the current Dalai Lama refers to a commentary on the abbreviated Kalachakra tantra by Kaydrub Norzang-gyatso that says practitioners of especially sharp faculties can achieve the same objectives with solely a jnanamudra partner. He concludes "Thus it is not absolutely mandatory to rely on a physical karmamudra partner".