2 aniyata
From Dhamma Wiki
The two aniyata (indefinite rules):
The aniyata are two indefinite rules where a monk is accused of having committed an offence with a woman in a screened (enclosed) or private place by a lay person.
It is indefinite because the final outcome depends on whether the monk acknowledges the offence.
Benefit of the doubt is given to the monk unless there is over-riding evidence. Thus it is not proper for a monk to be alone with a woman, especially in screened or private places.
1. Should any bhikkhu sit in private, alone with a woman on a seat secluded enough to lend itself (to sexual intercourse), so that a female lay follower whose word can be trusted,
having seen (them), might describe it as constituting any of three cases, entailing defeat, communal meetings, or confession, then the bhikkhu, acknowledging having sat (there), may be dealt with in line with any of the three cases,
entailing defeat, communal meetings, or confession, or he may be dealt with in line with whichever case the female lay follower whose word can be trusted described. This case is indefinite.
2. In case a seat is not sufficiently secluded to lend itself (to sexual intercourse) but sufficiently so to address lewd words to a woman, should any bhikkhu sit in private, alone with a woman on such a seat, so that a female lay follower whose word can be trusted, having seen (them),
might describe it as constituting either of two cases, entailing communal meetings or confession, then the bhikkhu, acknowledging having sat (there), may be dealt with in line with either of the two cases,
entailing communal meetings or confession, or he may be dealt with in line with whichever case the female lay follower whose word can be trusted described. This case too is indefinite.
(from the Vinaya Pitaka)
Source
http://www.dhammawiki.com/index.php?title=2_aniyata_%28indefinite_rules%29
