Why did Muzan turn into a woman?


I know that Muzan is a shapeshifter, and can change his biology and and
appearance at will, but why did he specifically choose to turn into a _woman_?
What was the reason for that?




if i'm not mistaken, the reason why muzan shape-shift is to hide his real
identity or his face from the demon slayers. I think this is also the reason
why the pillars were shocked when oyakata-sama revealed that tanjiro had a
brief encounter with muzan.

