Teshuvot Maharam, Berlin Edition, Part I
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דע לך חביבי כי מותרת אשה לבעלה לשמש לאלתר אחר טבילה ואף ביום כגון בחול כשטובלת ביום ח' משום גנבי' ובשבת אסר ר"ת לטבול ביום ח' משום דתרי קולי לא עבדי' להרחיק חפיפה מטבילה וגם לטבול ביום.
Rabbi Meir of Rothenburg, his life and his works, by Irving A. Agus. Philadelphia, 1947
A woman is permitted to cohabit with her husband immediately after her immersion in the ritual bath, even if such immersion took place in the daytime [of the eighth day]. However, R. Tam holds that a woman is not permitted to immerse herself in a ritual bath during the daylight time of Sabbath even if it be her eighth day. SOURCES: L. 507; P. 288.