Halakhah for Niddah 61:42

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, ...