Or, is the halakha in accordance with the opinion of Rabbi Shimon, who ruled that one who is destructive in causing a wound on Shabbat is liable if he did so intentionally?

With regard to the halakha of engaging in intercourse with one’s virgin bride on Shabbat, it was stated that in the school of Rav they say: Rav permitted doing so and Shmuel prohibited doing so. In Neharde’a, where Shmuel lived, they say: Rav prohibited doing so and Shmuel permitted doing so. Rav Naḥman bar Yitzḥak said: And your mnemonic is: These are lenient with regard to themselves, and those are lenient with regard to themselves. Each attributes the lenient ruling to the local halakhic authority, whose ruling is binding in that locale.

The Gemara asks: And did Rav permit engaging in intercourse in those circumstances? But didn’t Rav Shimi bar Ḥizkiyya say in the name of Rav: In the case of this cloth stopper of a barrel [nazyata], it is prohibited to insert it tightly in the spout of the barrel on a Festival, because in the process liquid will be squeezed from the cloth, and squeezing liquids is prohibited on Shabbat and Festivals. Apparently, Rav prohibits even unintentional actions.

The Gemara answers: In the case of the barrel, even Rabbi Shimon concedes, as it is Abaye and Rava who both say: Rabbi Shimon concedes in the case of: Cut off its head and will it not die, i.e., a case that involves inevitable consequences like the decapitation of an animal, that the action is forbidden. Here, the liquid will inevitably be squeezed from the cloth.

The Gemara asks: But didn’t Rav Ḥiyya bar Ashi say that Rav said with regard to unintentional acts: The halakha is in accordance with the opinion of Rabbi Yehuda, and Rav Ḥanan bar Ami said that Shmuel said: The halakha is in accordance with the opinion of Rabbi Shimon. And Rav Ḥiyya bar Avin taught these rulings directly, without citing additional men who transmitted them. Rav said: The halakha is in accordance with the opinion of Rabbi Yehuda, and Shmuel said: The halakha is in accordance with the opinion of Rabbi Shimon. How then did Rav permit intercourse with one’s virgin bride on Shabbat?

The Gemara answers: Actually, Rav holds in accordance with the opinion of Rabbi Yehuda. According to that version that said that the blood is pooled, he is destructive vis-à-vis the opening. According to that version that said that blood is flowing through blood vessels attached to the body, he is destructive in causing the wound, and Rabbi Yehuda concedes that it is permitted.

Rav Ḥisda raised an objection from a mishna (Nidda 64b). With regard to a young girl whose time to see the flow of menstrual blood has not arrived, as she has not yet reached puberty, and she married, Beit Shammai say: One gives her four nights during which she may engage in intercourse, as any blood is attributed to the ruptured hymen. Beit Hillel say: There is no limit. Rather, any blood she sees is attributed to the ruptured hymen until the wound heals.

If, however, her time to see the flow of menstrual blood has arrived, as she has reached the age of puberty, even if she has not yet menstruated, and she married, Beit Shammai say: One gives her the first night, during which the blood is attributed to the wound. Thereafter, the blood is presumed to be menstrual blood, and she is forbidden to her husband. Beit Hillel say: One gives her from Wednesday, the day designated for marriage of a virgin, until the conclusion of Shabbat, four nights. During that period, any blood is attributed to the wound, and she is permitted to her husband.