Sedamocanagāthā

Vinayapiṭaka · Parivāra · Vol. 8 · Section 1329

[1329] One would not engage in that sexual intercourse (methuna) with the three kinds of women, with the three kinds of men, nor with the three ignoble paṇḍakas; nor would one practice intercourse in the sexual organ (byañjana) — yet there could be cutting off (chejja) conditioned by the act of sexual intercourse. This problem has been thought out by the skilled.

English translation from the Pali (Siam Raṭṭha edition) — under review, not for citation.