Reference for Berakhot 42:18
וכי תימא ה"ה דאפילו בעל קרי גרידא נמי פטר רבי יהודה והאי דקא מפלגי בזב שראה קרי להודיעך כחן דרבנן אימא סיפא המשמשת וראתה דם צריכה טבילה
And shouldest thou say that in fact R. Judah even exempts a mere Ba'al Keri, and the point of variance [between him and the Rabbis] is the man with a running issue who experienced emission, to show thee the extreme view taken by the Rabbis, I then quote the latter part of the Mishnaic teaching : "A woman who during intercourse experiences the menstrual flow requires immersion."
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