Halakhah for Niddah 86:65
ממאי דמאו איש דשרץ קמרבי ליה דילמא מאו איש אשר תצא ממנו שכבת זרע קמרבי ליה
Now according to those who hold that a deduction is carried through in all respects<span class="x" onmousemove="('comment',' Lit., 'judge from it and (again) from it', i.e., all that applies to the case from which deduction is made is also applicable to the case deduced ');"><sup>51</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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