תלמוד בבלי יבמות נ"ג:
אנוס דמתניתין היכי דמי? אילימא כשאנסוהו עובדי כוכבים ובא עליה, והאמר רבא: אין אונס לערוה, לפי שאין קישוי אלא לדעת!. . . אלא כגון שנתכוון לאשתו, ותקפתו יבמתו ובא עליה.
What is the case of duress in the Mishna? It can't be where non-Jews forced him to have sex with her since Rava says, “There is no possibility of duress with regards to sex, since erections only happen willingly.” . . . Rather, it must be a case where he was thinking of his wife, then his potential levirate bride attacked him, and he had sex with her.
[Translation by Rabbi Steve Greenberg]
Suggested Discussion Questions:
Do the Rabbis apply the principle of beginning under duress and ending willingly here?
What makes this case different from the woman who was raped?
Why might the Rabbis be motivated to rule as they do here?
Time Period: Rabbinic (Maccabees through the Talmud)