In 19th century Western Europe, the most common way for girls to access education was at home, through private tutoring , and not at school, due to the strong resistance to women's involvement in schools. You are reading things into it that simply are not there. Whether it was actual "sex" or "fellatio" or whatever, when it occurs between a 50yr old teacher and a 15yr old girl, it is all inappropriate, is it not?
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You can be sure that the website gives an age limit on its front page. I have no daughters, but if I did my rules would be simple: I want to know who she is sleeping with. Can't you read? As in any witch hunt, many around you are keeping silent as to their true thoughts, or trying to hide them Larry Craig style by loudly condemning others.