 If you liked
Seitokai Yakuindomo
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 ...then you might like
Ore no Nounai Sentakushi ga, Gakuen Love Comedy wo Zenryoku de Jama Shiteiru
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Both shows are centered around comedy, making up at least 95% of the content, a majority of which are bad sex jokes. Also the characters and their interactions are similar.
both shows revolve around bunch of weird girls and a relatively normal guy
both shows are quite similar in how they deal with comedy rather: gags and references, so if you like the style of comedy in one, its likely you would enjoy the other as well.
i should say that they are practically pure comedy shows so dont expect a good story from either