Halakhah for Niddah 62:2
והיינו דאמר רב קטינא
in order that their wives should emit their semen first so that their children shall be males, Scripture attributes to them the same merit as if they had themselves caused the increase of the number of their sons and sons' sons. This explains what R. Kattina said, 'I could make all my children to be males'. Raba stated: One who desires all his children to be males should cohabit twice in succession.
Sefer HaChinukh
It is from the roots of the commandment [that it is] in order that she be aroused by action to give thanks to God, blessed be He, who saved her from the pangs of her birth, which is a miraculous thing. And also they, may their memory be blessed, said (Niddah 31b) that a woman rushes to swear at the time of her throes that she will no longer [have sexual relations with] a man. And therefore she requires atonement, and hence her sacrifice is called a sin-offering, and it is stated about her, "and the priest shall atone for her" (Leviticus 12:8).
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