4. Marital relations:[1]

When Tisha B’av falls on Shabbos and is pushed off until Sunday one may not have marital relations on Shabbos.[2]

Night of Mikveh:[3] If Friday night is the night of Mikveh, marital relations is permitted.[4]

Announcing in Shul: Some[5] are accustomed to announce after Shul that all private mourning matters are in effect this Shabbos. Others[6] avoid this announcement.

Mikveh Night on the ninth of Av:[7] A woman whose Mikvah night falls on Tisha B’av, must postpone it until the next night.[8] In such a case, she should perform the Chafifa [in hot water^[9]] on the day before Tisha B’av and on the night following Tisha B’av she should again bathe and clean herself, and then immerse.^[10] When Tishe Beav falls on Sunday, or on Shabbos and is differed to Sunday, then she is to perform the Chafifa on Erev Shabbos, and again two nights later on Sunday night, Motzei Tishe  Beav.[11]

Is one to follow Harchakos on Shabbos Tisha B’av?[12] Some[13] write Harchakos are to be kept throughout Shabbos until after Tisha B’av. At the very least one is to avoid affectionate touch. [According to Admur, and the simple ruling of Shulchan Aruch, there is no need to be stringent regarding Harchakos, as stated above, although one is to avoid affectionate touch or sleeping in the same bed.]

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[1] 554:19

[2] Rama ibid

Ruling of Michaber/Sefaradim: The Michaber ibid rules that even marital relations is permitted on Shabbos, and so is the Sefaradi custom. [Moreh Baetzba 234; Kaf Hachaim 554:86] However, Rav Yaakov Yosef stated in the name of the Pachad Yitzchak and Eretz Chaim that the Sefaradi custom is to be stringent like the Rama against the Michaber, unlike the ruling of the Chida. He writes that it is even forbidden to bateh in cold water, unless it is for the ened of a Mitzvah.

[3] Shlah; Zera Emes 80; M”B 454:40; Many Poskim in Kaf Hachaim 554:88; So concludes Piskeiy Teshuvos 554:17 to be the Rabbinical directive.

Other Opinions: Some Poskim rule one is to delay Mikveh night until after Tisha B’av. [Elya Raba 554:19] Some Poskim rule it is not allowed if his wife is pregnant or nursing, as it is only allowed for Peru Urevu. [Minchas Elazar 5:86; Sheivet Haleivi 6:70]

[4] The reason: As the night of Mikveh there is a Mitzvah of Onah. Vetzaruch Iyun from Chasam Sofer who rules there is no Mitzvah of Onah on Mikveh night, and so is the accepted ruling regarding a woman whose Mikveh night coincides with a Yom Chashash.

[5] Darkei Moshe, brought in M”B ibid

[6] See M”B ibid and Shaar HaTziyon 45

[7] Michaber 554:8; Admur 613:21

[8] Michaber ibid

[9] Derech Hachaim ibid; M”B 551:92; Kaf Hachaim 551:194

[10] M”A 554:10; M”B 554:18; Degul Merivava 551:3; Biur Halacha 551:16 “Im” based on Shach 199:9 that from the letter of the law the Chafifa must be done on Erev Tisha B’av; Kaf  Hachaim 551:198; Kitzur Dinei Taharah 5:14; Taharah Kehalacha 18:22 and so I received from Harav Asher Lemel Hakohen

Other opinions: Some Poskim rule she is to perform the Chafifa only on Motzei Tisha B’av in a case that she is able to do so. [Rama 551:16; Agudah; Beis Hillel Y.D. 199; Elya Raba 554:9; Chayeh Adam 133:19; Derech Hachaim 7; Kitzur SHU”A 122:12; Shiurei Sheivet Haleivi 199:4; Piskeiy Teshuvos 551:47; See Yoreh Deah Rama 199:4 that the Chafifa of Erev Shabbos when immersing on Motzei Shabbos is only a custom. See Kaf Hachaim 551:195]

[11] Shach 199:6; Sidrei Taharah 199:18; Taharah Kehalacha 18:20

[12] Piskeiy Teshuvos 554:17 footnote 80

[13] Mahril Diskin 5:67