Halakhah for Niddah 86:39
חומר בשרץ שהשרץ אין חלוקה טומאתו מה שאין כן בשכבת זרע
Come and hear: In one respect the law of semen is more restrictive than that of a dead creeping thing while in another respect the law of a dead creeping thing is more restrictive than that of semen. 'The law of a dead creeping thing is more restrictive' in that no distinction [of age] is made about its uncleanness,<span class="x" onmousemove="('comment',' Young and old are equally unclean. ');"><sup>28</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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