And then, how about incest being forbidden? ~~ see e.g. Lev 18 vi ff ~~ so what did Lot's naughty daughters think they were up to, getting their old man pissed & then getting him to shag them, eh? Or is    the fact that that happened chronologically before the old boy gave Moses all those rules supposed to make a difference?
I wouldn't have thought so ~ would you, Iona?