Halakhah for Niddah 86:3
תיקו
where we follow the time of the detachment even where the woman can restrain the discharge [the question would arise], Does this apply only to the Israelitish woman who is Pentateuchally unclean but not to an idolatress who was a zabah, since she is only Rabbinically unclean,<span class="x" onmousemove="('comment',' Cf. supra n. 5. ');"><sup>3</sup></span>
Sefer HaChinukh
From the laws of the commandment is that which they, may their memory be blessed, said (Niddah 43b) that the measure for one who touches [it] is like [the size of] a lentil, and for one who [experiences] the emission is with the smallest amount. And it is one, whether he [experiences] the emission accidentally or volitionally, he is impure. And the seed of a young child does not render impure. And red seed does not render impure, but rather [only] white. And any seed that a man does not feel - not at the beginning and not at the end - is not impure. And one who has [improper] thoughts at night, and saw in a dream that he had sexual relations and got up and found his flesh [to be] warm, is impure - even though he did not [knowingly experience] semen. And the rest of its details are elucidated in Tractate Zavim (see Mishneh Torah, Laws of Offerings for Those with Incomplete Atonement 1).
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