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People don't necessarily speak to every potential date in exactly the same voice.
Researchers recorded real conversations between men and women during speed-dating events.
Men tended to lower their voice pitch when speaking with women they selected as potential partners.
Women also changed their pitch depending on how attractive or desirable they found the man.
Interestingly, women's voices didn't simply become higher whenever they liked someone—the pattern depended partly on how desirable the man was to other women too.
These changes can happen naturally during conversation rather than as a deliberate flirting technique.
Sometimes attraction can literally change the way someone sounds.
© Evolution and Human Behavior (2019)