Yevamot 60A

שאין משלם קנס במפותה.

that he does not pay the fine of a seduced woman. One who seduced a woman and does not wish to marry her must pay a fine (see Exodus 22:14–15). Since in this case he did marry her, he is not liable to pay the fine even though he is required to divorce her.

אזל רב גביהה מבי כתיל, אמרה לשמעתא קמיה דרב אשי. אמר ליה: והא רב ורבי יוחנן דאמרי תרוייהו: בוגרת ומוכת עץ ⁠— לא ישא, ואם נשא ⁠— נשוי.

The Talmud relates that when Rav Geviha went from Bei Ketil he stated this halakha before Rav Ashi, who said to him: Isn’t it Rav and R' Yoḥanan who both say: A High Priest may not marry a grown woman and a woman whose hymen was torn accidentally, but if he married one of them he is married?

אלמא: סופה להיות בוגרת תחתיו, סופה להיות מוכת עץ תחתיו. הכא נמי: סופה להיות בעולה תחתיו. קשיא.

Apparently, the reason for this halakha is that since she will eventually be a grown woman under him, i.e., while married to him, and she will eventually be a woman whose hymen was torn under him, as she will not remain a virgin, they are permitted to remain married after the fact. Here too, in the case of a High Priest who married a woman he raped or seduced, since she will eventually be a non-virgin under him, the baraita should be understood as stating that they may remain married. The Talmud concludes: Indeed, this is difficult for Rav Huna.

אנוסת חבירו ומפותת חבירו ⁠— לא ישא. ואם נשא ⁠— רבי אליעזר בן יעקב אומר: הולד חלל, וחכמים אומרים: הולד כשר. אמר רב הונא אמר רב: הלכה כרבי אליעזר בן יעקב. וכן אמר רב גידל אמר רב: הלכה כרבי אליעזר בן יעקב.

§ The baraita cited above taught: With regard to a woman who was raped by another man and a woman seduced by another man, the High Priest may not marry her. And if he married her, R' Eliezer ben Ya’akov says that the child born from this union is a ḥalal, and the Rabbis say the lineage of the offspring is unflawed. Rav Huna said that Rav said: The halakha is in accordance with the opinion of R' Eliezer ben Ya’akov. And, so too, Rav Giddel said that Rav said: The halakha is in accordance with the opinion of R' Eliezer ben Ya’akov.