Rosario to Vampire, Ladies versus Butlers! Recommendations
The humor is very similar, mostly based around ecchi and stupid, stupid girls. Both are also very much "fish out of water" stories; Tsukune is a human in a school for monsters; Akiharu is a normal guy in a school for ladies, butlers and maids. Then there's the best part, both shows don't take themselves seriously, it's ecchi fun! Watch with your brain switched off.
Harems at their best, this will satisfy anyone who loves to see panty shots, huge breast, and pretty ladies (and lolis). With a story that barely sees the light of day in this anime, you'll be glad to know you'll be distracted from the problem at watching this Harem anime.