According to Tsongkhapa, both practitioners of physical action seal yoga should be of the highest capacity, have tantric initiations, be learned in tantra and be able to keep the pledges ("samaya"), be skilled in the practice of the tantric sadhana and be mature in practicing four daily sessions of yoga. They should also be skilled in meditation on emptiness and in the techniques of inducing the four blisses. Tsongkhapa states that if they do not have these qualities, practicing physical sexual yoga is unwise. In this case, one should just practice with a visualized consort.