Vajrayāna rituals also include sexual yoga, union with a physical consort as part of advanced practices. Some tantras go further, the "Hevajra tantra" states ‘You should kill living beings, speak lying words, take what is not given, consort with the women of others’. While some of these statements were taken literally as part of ritual practice, others such as killing were interpreted in a metaphorical sense. In the Hevajra, "killing" is defined as developing concentration by killing the life-breath of discursive thoughts. Likewise, while actual sexual union with a physical consort is practiced, it is also common to use a visualized mental consort.