best Harem  Anime To Watch.

High School DxD

High school student Issei Hyoudou is your run-of-the-mill pervert who does nothing productive with his life, peeping on women and dreaming of having his own harem one day. 

Basara Toujou learns the hard way the day his father brings home two beautiful girls and introduces them as his new siblings

The Testament of Sister New Devil

When Kazuya Souma is unexpectedly transported to another world, he knows the people expect a hero. But Souma wants to rebuild the flagging economy of the new land he's found himself in! 

How a Realist Hero Rebuilt the Kingdom

Sekirei the best adult anime with a harem, Minato Sahashi who failed his entrance exams, While returning home a beautiful woman falls from the sky on him, yup from the sky.

Sekirei

There is an uncensored  version, and I know you guys will only watch the uncensored one. Because we are same brother we are the same. 

Harem in the Labyrinth of Another World