Halakhah for Niddah 61:15
דרתי לא נאמר אלא רקמתי מאי שנא
marital intercourse is injurious to the woman and it is also injurious to the child. During the middle ones it is injurious to the woman but beneficial for the child. During the last months it is beneficial for both the woman and the child, since on account of it the child becomes well-formed and of strong vitality.
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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