Leanna's Slice of Life maybe? The heroine is a gullible sexual retard who ends up being taken advantage of in a million different ways (e.g. the local baker convinces her that he needs to practice kneading with her tits). I must warn you that technically it is an NTR game as the heroine is married, but thankfully the NTR aspect isn't too "strong". Also, as the game progresses, she becomes less and less sexually oblivious ("corruption" is a major theme of the game).