Mahīśāsaka Vinaya
Bhikkhunī Vibhaṅga
Confession 201
Origin Story
At that time, the bhikkhunīs bathed in water and went against the current. They were touched by the water and sexual desire arose in their minds. Thereupon, they returned to lay life, or became non-Buddhist renunciates. When the senior bhikkhunīs heard it, they criticized them in all kinds of ways, … “I now lay down a precept for the bhikkhunīs, as explained above. From now on, this precept should be recited thus:
Final Ruling
‘If a bhikkhunī goes against the current in water, it’s a pācittiya.’”
Explanations
If she goes against the current, each step is a pācittiya. If she emits sexual fluid, it’s a thullaccaya.
For a sikkhamānā and a sāmaṇerī, it’s a dukkaṭa.
If she doesn’t have a lustful mind, the offense isn’t committed.