 If you liked
B-gata H-kei
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 ...then you might like
Ore no Imouto ga Konnani Kawaii Wake ga Nai
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It gives the same way of feeling and have a similar view on the sex; what's more the main chars both are crazy are a little bit insane and a boy is shy and don't know what he exactly want.
In both series main characters are girls who have some kind of specific problems.
I can even say that they both are of tsundere type.
In fact, they're alike in physical appearance.
And those girls have complicated relationships with male main characters who are ordinary guys in general.