Dam betulim (Hebrew: דם בתולים, lit. 'blood [of the] virgin[al]') in Judaism refers to the emission of vaginal blood that is often exuded upon the first time a woman has sexual intercourse and her hymen is penetrated. After the blood exudes, the woman becomes a niddah (Hebrew: נִדָּה), and the couple must refrain from further sexual intercourse until the woman completes her purification process. For this reason, it has sometimes been practice for couples to refrain from sexual intercourse until several days after marriage in order to be able to remain physically intimate for a longer period directly following the wedding.^[1]

v t e Marital life in Judaism
Jewish wedding	Chuppah Erusin Jewish views on marriage Jewish wedding Ketubah Prenuptial Sheva Brachot Shidduch Yichud
Prohibitions and Halakhot	Cunnilingus in Halacha Fellatio in Halacha Forbidden relationships in Judaism Jewish views on incest Negiah Prohibition of extracting semen in vain (Judaism) Rabbi Zeira's stringency Head covering for married women Tzniut Yichud You shall not commit adultery
Women forbidden to their husbands	Childbirth Dam betulim Niddah
Purity of a woman to her husband	Hefsek taharah Mikveh Tvilah
Jewish divorce	Agunah Get Heter meah rabbanim