אורח חיים ר״פOrach Chayim 280

Se’if 1א׳

תַּשְׁמִישׁ הַמִּטָּה מִתַּעֲנוּגֵי שַׁבָּת הוּא, לְפִיכָךְ עוֹנַת תַּלְמִידֵי חֲכָמִים הַבְּרִיאִים מִלֵּיל שַׁבָּת לְלֵיל שַׁבָּת.

1. The Laws Pertaining to Marital Intimacy on Shabbat, 2 Seifim: Marital intimacy is one of the expressions of Shabbos pleasure. Accordingly, [our Sages] determined that healthy Torah scholars, who are obligated to fulfill their conjugal duties once a week, should do so each Friday night.

Se’if 2ב׳

מֻתָּר לִבְעֹל לְכַתְּחִלָּה בְּתוּלָה בְּשַׁבָּת, וְאֵין בּוֹ מִשּׁוּם חוֹבֵל וְלֹא מִשּׁוּם צַעַר לָהּ.

2. It is permitted to engage in marital intimacy with a virgin for the first time on Shabbos. There is no prohibition because of causing pain or damage on Shabbos as a result of her initial intimate experience.