I asked around and found out that the Shulchan Aruch YD 182:1 doesn’t permit it because of v’Lo Yilbash Gever Simlas Ishah (Devarim 22:5 — so it is a m’daraisa prohibition). Rambam Mishneh Torah, Hilchos Avodas Kochavim 12:1 wrote: “Our Sages did not determine the amount of hair which must be left at the corners of our temples. We have heard, however, from our elders that one must leave at least forty hairs.” Rambam Hilchos Avodah Zarah 12:9 wrote: The Torah permits a man to remove hair from other parts of the body (other than the beard or sideburns), e.g. the underarms and Ervah.
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