Halakhah for Niddah 61:64
כדרבי אבהו דרבי אבהו רמי
Our Rabbis taught: At first it used to be said that 'if the woman emits her semen first she will bear a male, and if the man emits his semen first she will bear a female', but the Sages did not explain the reason, until R. Zadok came and explained it: These are the sons of Leah, whom she bore unto Jacob in Paddan-aram, with his daughter Dinah,<span class="x" onmousemove="('comment',' Gen. XLVI, 15. ');"><sup>57</sup></span>
Tur
And if he was married he should not be too regular (often) with his wife, and if as they say "that talmidai chachomim should not be found by their wifes and roosters" (this ment) not sposificly talmidai chachomim but the same law is also every man, they wrote "talmidai chachomim" since abstinent if found by them, ...
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