Like, Polygamy may be allowed but that doesn't mean that the values you were raised on make it acceptable to, well, you and the people you're making a harem out of and I wish that mangas would acknowledge that to some degree instead of just using it as a free ticket to a harem.
Last Panel: You....you could also just, like, make an underwater tunnel. You've literally made a mansion before, and if there's a stampede you can flood the damn thing.