A major plot point is a group of women who can so expertly perform sexual favors that they completely override the free will of men.
Said it before and say it again. Dune only makes sense if you remember that every character you see is a product of multiple generations of incest, religious zealots, and useless idle royality.
The entire power of the Bene Gesserits could be defeated with 40 cents set of ear plugs, or hiring gay guys, or straight women, or deaf people, or straight men on libido blockers, or asexuals, or stubborn people, or people who speak a different language…
Their power is using sexy voice. Some random teenager with a slingshot is more dangerous.