Is there any good romance animes with a female devil?

I'm looking for something along the lines of a comedy/romance anime, I love the harem style, the ecchi, the "Toilet Humor" if you will, it just jump starts my heart when I find one I like, so please, if you know any animes that could fit my "Devilish" desired here, would you be so kind as so enlighten me with their names?