# Men have an obligation to procreate<ref>Yevamos 65b. Shulchan Aruch Even Haezer 1:1 and 1:5 mentions that a man should endeavor to father at least one boy and one girl.</ref> and an additional obligation to marry even if he has already fulfilled his obligation to procreate<ref>Yevamos 61b; Shulchan Aruch, Even Haezer 1:8.</ref>. Men may not unnecessarily prolong singlehood<ref>Tosefta, Yevamos 8:2.</ref>.
# Women are exempt from the obligation to procreate<ref>Yevamos 65b</ref> and thus may have no obligation to marry<ref>Tosefta, Yevamos 8:2; Shulchan Aruch, Even Haezer, 1:13. However, see Rama (ibid.) and Sanhedrin 76a-76b.</ref>.
# Although men become obligated to perform mitzvot upon reaching majority (age 13), learning Torah takes priority over marriage until age 18, and thus men have no obligation to marry beforehand<ref>
Avos 5:21; Shulchan Aruch, Even Haezer 1:3; Chelkas Mechokeik, ibid. §2. Cf. Rambam, Hilchos Ishus 15:2. </ref>. # Ideally, one should attain a livelihood before marriage<ref>Sotah 44a; Rambam , Hilchos Dei’os 5: 11.</ref>.# Ideally, a man should marry before age 20 while continuing to learn Torah; however, if one finds it impossible to do both, due to the financial burden of sustaining a family, learning Torah takes precedence and he may delay marriage past age 20.<ref>Kiddushin 29b; Shulchan Aruch, Even Haezer 1:3.</ref> It is unclear how long such delay may extend:<ref>Rosh to Kiddushin 29b.</ref> some suggest that one may continue learning until he feels satisfied with the amount of Torah he has learned,<ref>Levush, Even Haezer 1:4, cited in Aruch Hashulchan, Even Haezer 1:13.</ref> while others suggest an absolute limit of age 24.<ref>Yam Shel Shlomo, Kiddushin §47, cited in Aruch Hashulchan, Even Haezer 1:13; see Rashi and Rosh to Kiddushin 30a.</ref># If an unmarried man finds it impossible to avoid experiencing hirhurim, marriage takes precedence over learning Torah.<ref>Kiddushin 29b; Shulchan Aruch, Yoreh Dei’ah 246:2 .</ref> It is forbidden to fantasize about sinning.<ref>Berachos 12b.</ref>
# If one truly loves learning Torah to the extent that Ben Azai did<ref>See Tosefta Yevamos 8:5; Yevamos 63b; cf. Kesuvos 63b; Sotah 4b.</ref> and is totally devoted to the Torah, he is not prohibited from delaying marriage indefinitely, provided that his sexual desire does not overcome him;<ref>Shulchan Aruch, Even Haezer 1:4.</ref> nevertheless, one should not do so.<ref>Taz EH 1:6.</ref> Ben Azai’s example is exceptional; such people are extremely rare.<ref>Rosh to Kiddushin 29b; Ritva to Yevamos 63b.</ref>
# One may delay marriage until he can find a suitable or compatible wife.<ref>Yad Dovid, Vol. 3, 15:6 (cited in Frankel’s “Sefer Hamafteach” to Rambam, Hilchos Ishus 15:2).</ref>