*sense or nonsense of condoms -in their particular post-apocalyptic situation-, where condoms are not easily available, and after having spent weeks (months?) together they can be decently sure about each other’s health, yet one might be principled or worry about the aforementioned lack of a douche.

Real life people remember, while there are alternative means to protect you from HIV (such as PrEP), there’s a bunch of other stuff you could catch.