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Marital relations:<a href="#ftn1" name="ftnref1">[1]</a> 
Marital relations are forbidden on Yom Kippur. 
Harchakos:&nbsp; All the laws of Harchakos that apply when ones wife is in the state of Nida apply equally throughout the entire<a href="#ftn2" name="ftnref2">[2]</a> duration of Yom Kippur even if ones wife is pure. This is a safeguard to avoid marital relations. 
Speaking with wife: One should refrain from excessive speech with one’s wife on Yom Kippur.
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<a href="#ftnref1" name="ftn1">[1]</a> 615/1
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<a href="#ftnref2" name="ftn2">[2]</a> By Tishe Beav we rule that by day one may be lenient. Seemingly this is because by T.B.&nbsp; its only a Rabbinical prohibition and by day there is less of a suspicion that they will have relations. 
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Shulchan Aruch HaRav | Marital relations on Yom Kippur

Marital relations:[1] Marital relations are forbidden on Yom Kippur. Harchakos: All the laws of Harchakos that apply when ones wife is in the state of Nida apply equally throughout the entire[2] duration of Yom Kippur even if ones wife is pure. This is a safeguard to avoid marital relations. Speaking