Surely the humor is in the country bumpkin believing that a daily bath is unusual, and only a habit of someone extremely dirty.
They get so dirty so quickly they need to bathe way more often than someone who does not play in dirt and filth.
who needs to bathe a lot unless they are very dirty? airtight reasoning
First impression is dirty in bed, turns out she is just getting filthy and needs to bath a lot
That might be a part of it, but it is a translated joke - so the double entendre of “dirty” may not be intentional
Yeah, "dirty" in russian doesn't have the sexual connotation to it. Funny enough, "hot" still has that connotation.
That's funny because the combo of "French", "girl" and "dirty" definitely leans towards sexual connotations in the US and without it I don't find the joke funny at all.