Teaching a non-Jew

I wanted to tell my non-Jewish sister some basic ideas of taharat ha mishpachah. A Rav told me not to do so, as we must not teach Torah to non-Jews. But if she would use the Internet, she could learn everything by herself.
If teaching detailed laws in the internet is allowed, why may I not teach only basic ideas personally?

Dear questioner,

Thank you for your question.

The custom is that only detailed and formal instruction is prohibited when teaching a non-Jew.  You may relay some general and broad concepts that are illuminating regarding Judaism's attitude to the couple relationship.  It is true that she may turn to the internet and learn some details on site, but that is her decision and one that cannot be controlled. 

This internet service does not preclude, override or replace the psak of any rabbinical authority. It is the responsibility of the questioner to inform us of any previous consultation or ruling. As even slight variation in circumstances may have Halachic consequences, views expressed concerning one case may not be applied to other, seemingly similar cases.

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