One who has intercourse with his yevamah, whether in error or with presumption, whether under compulsion or of his own free will, even if he acted in error and she in presumption, or he in presumption and she in error, or he under compulsion and she not under compulsion, or she under compulsion and he not under compulsion, whether he only began to have intercourse or he completed having intercourse, he has acquired her as a wife. The laws do not make a distinction between different types of intercourse.

Similarly, one who has intercourse with any of the forbidden relatives listed in the Torah, or with any of those who are disqualified to marry him as, for instance, a widow to a high priest, a divorced woman or a halutzah to a common priest, a mamzeret or a netinah to an Israelite or the daughter of an Israelite to a mamzer or a nathin, he has disqualifed [her from marrying a priest], and the laws do not make a distinction between different types of intercourse.

A high priest shall not marry a widow whether she became a widow after a betrothal or after a marriage. He shall not marry one who has reached puberty. Rabbi Eliezer and Rabbi Shimon permit him to marry one who has reached puberty, but he may not marry one who lost her virginity through a stick. [A priest who] betrothed a widow, and was subsequently appointed high priest, may bring her into marriage. It once happened with Joshua ben Gamla that he betrothed Marta the daughter of Boethus, and the king appointed him high priest, and he brought her into marriage. If a shomeret yavam became liable to have yibbum with an ordinary priest and then he was appointed high priest, even though he already did ma’amar, he may not bring her into marriage. A high priest whose brother died must perform halitzah but may not contract yibbum.

An ordinary priest shall not marry a woman incapable of procreation, unless he already has a wife or children. Rabbi Judah said: even though he has a wife and children he shall not marry a woman incapable of procreation, since she is a zonah, as mentioned in the Torah. But the Sages said: the term zonah implies only a female convert, freed slavewoman and one who has been subjected to illicit intercourse.

A man shall not abstain from procreation unless he already has children. Beth Shammai says: two males, And Beth Hillel says: male and a female, for it says, “Male and female created he them” (Genesis 5:2). If a man married a woman and lived with her for ten years and she bore no child, he may not abstain [any longer from the duty of propagation]. If he divorced her she is permitted to marry another, and the second husband may also live with her for ten years. If she miscarried [the period of ten years] is counted from the time of her miscarriage. A man is commanded concerning the duty of propagation but not a woman. Rabbi Yohanan ben Beroka says: Concerning both of them it is said, “And God blessed them; and said to them… “Be fruitful and multiply” (Genesis 1:28).