I'm not really sure yaoi and fujoshi make up a decent percentage of women anime/manga fans. I think they are visible a lot because anime makes them the stock female otaku or a type of them, but if you have read or watched that genre of anime, there's no way in hell most women would like it, if just for the disturbing control issues and male harm. Like the anime Loveless is probably the closest i can think of to an anime that mainstreams those tropes, and its a good illustration why that genre is nowhere as big as shoujo. IDK though, I haven't talked to or seen many actual fujoshi in the west I guess.
