I just made an unpleasant mental connection.
<
https://en.wikipedia.org/wiki/Virgin_cleansing_myth>
The very harmful belief that, loosely speaking,
a sexual disease will leave you if you give it to
someone else.
As you say, as we know, that's not how this works.
Not in the real world with real communicable
diseases. Some of what "it" is leaves you, but
plenty stays.
Now, the worlds of Oglaf abound with supernatural
entities, visible and not, gods, fairies, curses, that
take an interest in sexual activity of conventionally
living beings (in a metabolic sense). Their interactions
which are shown are rarely pleasing once the story
ends. I suppose that that wouldn't be an especially
funny story, but some Oglaf pages seem to have
nothing funny anyway.
Most of the human recurring characters (is this one
here?) aren't great friends, either.
Here, there is an entity that possibly enjoys seeing
people wearing tiny kinky clothing, and that has the
power to make this be, and that dangles both ways,
as they say. If you escape quickly while it's distracted.
Perhaps you just need to change into other trousers,
but supernatural cautionary tales, at least for adults,
tend not to have an easy solution, or any solution.
Children's story problems, e.g. you are living with a
witch who plans to fatten and then eat you, are solvable.
An adult sees Death look at him funny and immediately
buys a fast horse to get away - that isn't going to work.
Maybe it's a complete con and this lady just gets you alone
and distracted and then steals your trousers and provides
a cheaper substitute and an unusual excuse. No thong fairy
involved at all. Though in the setting, thong fairy and trouser
thief are equally reasonable explanations.
Do you think I've spent more time on this than they did?