 If you liked
Love Hina
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 ...then you might like
Rosario to Vampire
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Both talk about the story of a loser boy who was never close to the girls and one day end up friends with a pretty girl and then, friends with several girls. Both have ecchi scenes too.
Also, some characters are very similar. Keitaro and Tsukune are the main, both are losers
, Kurumu and Narusegawa are hot blooded girls, Shinobu and Yukari are childs with child acts who loves main and Moka/Inner Moka looks like a split of Narusegawa's personalities.