Do lesbians exist?
In one study, arousal to different sexual stimuli was close to identical between self-identified heterosexual and homosexual women, but pronouncedly differed between gay and straight men in the direction you’d expect. My guess is it is mostly LARP.
The largest recent physiological study I could find seems to replicate this. All orientation groups in the sample showed arousal to stimuli depicting both male and female models to similar degrees. The nominally significant findings do not survive basic statistical hygiene.
What about neurological evidence? In one study, sound processing regions lit up more in all women to female stimuli (though there was confounding due to the loud moaning in the female video) and especially so in lesbians. Somatosensory regions lit up more in all orientation groups when watching male over female stimuli.
So far, I’ve seen little compelling evidence for the existence of a hard, homosexual orientation in women. The greater specificity hypothesis seems to only show up when looking at self-reported arousal as opposed to objective physiological responses.
Sources:
researchgate.net/publication/57…
pmc.ncbi.nlm.nih.gov/articles/PMC57…
pmc.ncbi.nlm.nih.gov/articles/PMC86…
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