What is the translation of "es Mekorah He'erah"?
Rashi: It is a Lashon 'Ervah'. 1
Rashi: The 'Vav' of which is added to form the noun - like 'Za'avah' from 'Za' and 'Achvah' from 'Ach.
What exactly does it mean in this context?
Rashi: Some say it means that the man's Milah 'kisses' (touches) the woman's Ervah; according to others, it means that it penetrates. 1 .
Tthough only partially.
And what are the implications of "es Mekor Damehah"?
Rashi: It teaches us that a woman is only a Nidah if she sees blood from the womb, not from any other source.
Why does the Torah mention Kares by a Nidah, seeing as she is included in the Kares that incorporates all the Arayos (in Vayikra 18:29)?