From the "Other" category, Sluts. Especially the multi chapter stories of the adventures of a promiscuous girl (or girls) who aren't afraid to have good unwholesome fun with different partners each chapter. Seems like I see one of those for every 1,000 Male protagonist Harem stories, which have begun to wear thin with me in recent times.
From the list, Cheating. But specifically the really happy go lucky stuff where it isn't hurtful or NTR, everyone is just going with the flow and having a raunchy good time, and when cheating is involved it's an extra naughty spice to the mix that appeals to me. Ozaki Akira is an absolute master at writing that kind of scenario.
Guess I fall somewhere in betwwen the Vanilla and Extreme crowds. Medium Spicy!