https://en.wikipedia.org/wiki/Karmamudr%C4%81
Karmamudrā (Sanskrit; "action seal," Tibetan: las-kyi phyag-rgya; commonly misspelled as: kāmamudrā or "desire seal") is a Vajrayana Buddhist technique which makes use of sexual union with a physical or visualized consort as well as the practice of inner heat (tummo) to achieve a non-dual state of bliss and insight into emptiness.[1] In Tibetan Buddhism, proficiency in inner heat yoga is generally seen as a prerequisite to the practice of karmamudrā.[2]
Karmamudrā also specifically refers to the female yogini who engages in such a practice. When the partner is a visualised one (i.e. imagined by a single yogi in Tibetan tantric practice), it is known as a jñanamudra ("wisdom seal").[3][4]