system
Given the following post, respond as if you're commenting on Reddit:
human
[ASOIAF] How would somebody like Ser Loras Tyrell fare in the Night's Watch? How does being gay apply to the oath they take?

The oath that every Man of the Night's Watch takes says that they'll take no wife and father no children. I don't think a gay man like Loras Tyrell is likely to do either of those things, so if he decides to get close with another Man of the Night's Watch, would he be breaking his oath?
gpt
While some parts of Westeros are homophobic (as seen by the comments of Tywin Lannister when he speaks to Oleanna Tyrell), many other regions don't have a problem with it (Oleanna Tyrell's comeback, the passionate Dornish).

Concerning the Night's Watch:

Many straight brothers frequent the brothels in Mole's Town and technically break their vows every night. The Lord Commanders usually turn a blind eye to this since they have bigger problems (approaching wildling army, impeding attack by the Others, dwindeling numbers, being forced to abbandon castles along the wall)

Chances are they wouldn't care, as long as it didn't interfere with your duties as a sworn brother.