 If you liked
Ueno-san wa Bukiyou
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 ...then you might like
Seitokai ni mo Ana wa Aru!
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Both mangas are about a peaceful school enviroment where most of the characters are girls and the one male character is the purest among them.
Both of mangas explore the sexual desires of young characters who are currently discovering this side of them with some innocence.
The key similarity between the two mangas is that the main male character of the series is innocent and clueless while the girls are the perverted ones. Except for the femboy, he's an exception.