Pakiṇṇaka 12

The Buddha was staying in Sāvatthī. At that time, a lustful bhikkhunī made a dildo out of gum, and attached it to the foot of her bed. Later, a fire broke out. She feared that it’d burn her bed and mat, so she brought them outside. Then lay people saw the fire that had flared up, (and thought): “Which place has been burnt, which place hasn’t been burnt?” When they saw it, they criticized her: “Why do renunciates make this unwholesome thing?” The bhikkhunīs for this reason went and informed … She answered: “I really did this.” The Buddha said: “From now on, it’s no longer allowed to make a dildo out of gum. ‘A dildo out of gum’ means making it out of gum, copper, lead, tin, pewter, ivory, beeswax, etc. If she makes a dildo like this to relieve a lustful mind, it’s a thullaccaya.” This is called the rule on dildos out of gum.