It would make sense to me - not only is the sun obviously the more powerful of the two, but the moon has an equally clear link to female fertility. So, in languages whose speakers had worked that out, the moon = female connection would seem logical. (Also accounts for how the moon goddesses tend to be virgins - pale, cold - but patronesses of childbirth!)
Dear me, this has got to be the least politically correct piece I've ever posted. The feminazis will be on my trail!