[364] Now at that time a certain bhikkhu, being lustful, gazed intently at the genitals of a woman. His semen (asuci) was emitted. He was remorseful … [the standard formula is elided in the Pali: he reported the matter to the Blessed One, who questioned him and ruled:] "There is no offense of saṅghādisesa for the bhikkhu. But, Bhikkhus, one who is lustful should not gaze intently at the genitals of a woman. Whoever should so gaze commits an offense of dukkaṭa (wrong-doing)."
English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.