"Two-thirds of open marriages are initiated by women says a survey from OpenMinded.com, a website for open marriage dating that polled 64,000 couples."

In my experience, most of the women who "don't like sex" are either bored/have never had good sex, don't feel safe in some way, or have internalized slut-shaming. But, then there’s this in addition:

And in four national surveys conducted between 1991 and 1996, women and men under the age of forty-five were basically neck and neck in the cheating game, while a 1992 survey found that American women aged eighteen to twenty-nine reported even more affairs than their male peers, and a more recent GSS found the same thing. Meanwhile, a 2017 study shows that among women aged twenty-five to twenty-nine, group sex and threesome experience equaled that of men the same age, and women were nearly twice as likely to have gone to a dungeon, BDSM, swingers’, or sex party, challenging the easy assumption that men are the naturally more sexually adventurous sex.

Martin, Wednesday. Untrue (pp. 41-42). Little, Brown and Company. Kindle Edition.