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And ye shall eat the flesh of your sons, and the flesh of your daughters shall ye eat. 26:29
Trivia: How long is a mother unclean after delivering a baby boy?
Notice that in this long list of relatives that you may not have sex with, there is one relative that is not mentioned -- your daughter. Nowhere in this list, or anywhere else in the bible, is sex between a man and his daughter (or, more generally, between parent and child) forbidden. 18:6-18, 20