四分律比丘含注戒本 2.33

2.33

若非人女、畜生女、黃門，若二根人同宿，吉羅。晝日，女立比丘臥者，吉羅。不犯者：不知彼室內有女；若室無覆，若半障、少障，若盡障；若半覆障，作句準上；若病臥；被縛；命、梵難等——並開。

If lodging together with a non-human female, an animal female, a paṇḍaka, or a person with two faculties, it is a duṣkṛta. During the day, if the woman stands while the bhikṣu lies down, it is a duṣkṛta. As for non-offense: not knowing there is a woman inside that room; if the room has no roof; if half-screened, slightly screened, or fully screened; if half-covered and screened, formulate the conditions according to the above; if lying down due to illness; being bound; perils to life, perils to the brahmacarya, and so forth—all are permitted.