It’s such a creepy biological characteristic. Bedbugs are mildly social, and prefer to sleep near other bedbugs. But the traumatic insemination seems to be unpleasant for the females, and after enough holes are poked all over their bodies, they will leave the main colony. A single inseminated female hitchhiker is normally how they infest new places.
Fluoride does not kill or sterilize anything. It reacts with enamel (hydroxyapetate) to convert it to a stronger version (hydroxyfluorapatite).
People who want their enamel to be softer and wear through are welcome to drink bottled water.