I've got problems understanding when we use a plural noun with "their".
e.g: In Hungary, village boys used to duck the girls in streams or fountains on Easter Monday. Now they sprinkle the girls with perfume for good luck and good health. The girls then give the boys eggs or invite them to their HOUSE/HOUSES for a meal which the girls themselves prepare and serve".
I would tend to say "houses" but the text says "house". What do you think?