https://www.mangago.zone/read-manga/the_virgin_witch/
just checked, the author is a woman
I dunno about manga but there’s loads of straight smutty fanfics on sites like AO3 that are women-dominant
most josei mangas are written by women
Pretty sure if you saw the author's other works are bl they are highly likely to be written by women.
The genre is called josei
I don’t read straight smut but is there even any straight smut written by women?