The Halachick discussion about planing a family-part 1

(5) One who is half slave and half free-man, serves his master one day and [works for] himself one day. These are the words of Beit Hillel. Beit Shammai said to them: "You have repaired [the situation] for his master, but for himself you have not repaired it. To marry a maidservant is impossible [i.e., forbidden], for he is half-free. [To marry] a free-woman is impossible, for he is half-slave. And was not the world created for the sake of reproduction, as it says (Isaiah 45:18) "Not for emptiness did He create it, but for settlement He formed it." Rather, due to Tikkun HaOlam, we force his master and he makes him a free-man, and [the slave] writes a document [of debt] for half his value. Beit Hillel retracted and ruled in accordance with the words of Beit Shammai.

(1) Every man is obligated to marry a woman in order to be fruitful, and to multiply and anyone who doesn't engage in being fruitful and multiplying is as if he spills blood, and lessens the appearance, and causes the divine presence to depart from Israel. Rem"a: He who does not marry is not allowed to make a blessing or to engage in Torah etc. and he is not called a man, and when he marries a woman, his sins are cast into doubt, as it is said: "One who has found a wife has found goodness and obtains favor in the eyes of God." (Proverbs 18:22)

(6) One may not abstain from procreation unless he [already] has children. Beit Shammai say: [One must have] two boys, and Beit Hillel say: [One must have] a boy and a girl, as it says, "Male and female He created them" (Bereishit 5:2). [If] one married a woman and waited for ten years and she did not bear children, he is not permitted to abstain [from his obligation]. [If] he divorced her she is permitted to marry somebody else, and the second [husband] is permitted to wait ten years with her. And if she miscarries he counts [ten years] from the point she miscarried. A man is commanded to procreate but a woman is not. Rabbi Yochanan ben Beroka says: It states to both of them, "And God blessed them and He said to them... be fruitful and multiply" (Bereishit 1:25).

(2) Men are obligated in procreation (periyya u-reviyya), but not women. When is a man obligated in this mitzva? From the age of seventeen. Once he reaches [the age of] twenty years and has not married, he has transgressed and neglected a positive commandment. However, if he is involved in Torah and engrossed in it, and he fears that if he marries, he will have to busy himself with supporting a wife and thereby come to neglect Torah study, then it is permissible for him to delay [marriage]; for one who is involved in a mitzva is exempt from another mitzva – all the more so regarding Torah study.

§ The Gemara comments: The mishna is not in accordance with the opinion of Rabbi Yehoshua. As it is taught in a baraita that Rabbi Yehoshua says: If a man married a woman in his youth, and she passed away, he should marry another woman in his old age. If he had children in his youth, he should have more children in his old age, as it is stated: “In the morning sow your seed, and in the evening do not withhold your hand; for you do not know which shall prosper, whether this or that, or whether they both alike shall be good” (Ecclesiastes 11:6). This verse indicates that a man should continue having children even after he has fulfilled the mitzva to be fruitful and multiply.

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Although a man has fulfilled the mitzvah of being fruitful and multiplying, he is bound by a Rabbinic commandment not to refrain from being fruitful and multiplying as long as he is physically potent.35 For anyone who adds a soul to the Jewish people is considered as if he built an entire world.36

Similarly, it is a mitzvah of our Sages that a man should not live without a wife,37 so that he will not be prompted to [sexual] thoughts.38 Similarly, a woman should not live without a man,39 so that she will not be suspected [of immoral conduct].

(5) One who is half slave and half free-man, serves his master one day and [works for] himself one day. These are the words of Beit Hillel. Beit Shammai said to them: "You have repaired [the situation] for his master, but for himself you have not repaired it. To marry a maidservant is impossible [i.e., forbidden], for he is half-free. [To marry] a free-woman is impossible, for he is half-slave. And was not the world created for the sake of reproduction, as it says (Isaiah 45:18) "Not for emptiness did He create it, but for settlement He formed it." Rather, due to Tikkun HaOlam, we force his master and he makes him a free-man, and [the slave] writes a document [of debt] for half his value. Beit Hillel retracted and ruled in accordance with the words of Beit Shammai.

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..Among our Sages' commands is that a person should marry off his sons and daughters close to the time they reach physical maturity.62 For were he to leave them [unmarried], they may be motivated to promiscuity or sexual thoughts. Concerning this was applied the verse [Job 5:24]: "Scrutinize your dwelling and you shall not sin."63.
It is forbidden to marry a woman to a minor, for this is comparable to promiscuity.64

A man is not permitted to abide without a wife.65 He should not marry a barren woman or an elderly woman who is not fit to bear children.66

A woman is permitted not to marry at all or to marry a eunuch. 67 A young man should not marry an elderly woman, nor an elderly man, a young woman, for such conduct leads to promiscuity.68

Yehudit, wife of Rabbi Ḥiyya, who would have painful childbirths and therefore wished to leave Rabbi Ḥiyya? She said to Rabbi Ḥiyya: My mother told me: When you were young your father accepted betrothal on your behalf from another man, which would render Yehudit forbidden to Rabbi Ḥiyya. He said to her: It is not in your mother’s power to render you forbidden to me, as this testimony is insufficient.