Sora no Otoshimono, Hentai Ouji to Warawanai Neko. Recommendations
Both anime contains ecchi content and the male lead ends up with several girls interested in him; can call that a harem. The male lead is also a pervert who gets involved with supernatural things.
In a way, I find these two series somewhat alike.
Both main protagonists from the series have frequent indecent thoughts of the main female characters. In particular, there are characters who berates him for it and calls him a 'pervert'.
The setting of both series also takes place in a school life environment where there is drama, comedy, and romance.
Both series also contains a supernatural theme added to them that seems to destiny that leads to the protagonist towards on what he is from the very first episode.
Sora no Otoshimono is like Henneko because:
1 Main Character:
In both series the main characters are somewhat perverted but are really nice.
2 Main Heroin:
Main heroins are unemotional
Both male protagonist are extreme perverts who act upon it at any given time.
Other then that there isn't much to say for a anime that is still airing.