sam2 (and on the ball): I checked the Sefer Hachinuch today and indeed, towards the end of his peirush on the mitzvah -that deals with kirva-he writes ; “this mitzvah applies all the time, everywhere and for men and women. ” He conitnues to expound upon it. So, clearly, he believes that this “lav’ of “kirva” applies to all.However, he also brings dowm the Ramban who maintains that the “issur’ of “kirvah” is only miderabbonon and it is a gezeirah, so as to avoid more stringent aveiras.
on the ball- thanks for pointing out the Rashi (it is from medrash Toras Kohanim). However, from that rashi, it is not evident that “kirvah’ is what is meant. Rashi says that because we need a “lav” for any of the “ervas” for a woman. Remember “ein onshim elo im keim mazhirim” you cannot punish unless you have forewarned someone. And, as in Kedsohim, it is clear that women are punished for “gilui aroyos”, the Toras Kohanim has to find the “lav’ for women. It is not clear that it applies to “kirva’ by itself.