Northeastern University doctoral candidate Mollie Ruben and her team found that lesbians were more able to correctly identify other lesbians than straight women.
The study filmed five lesbians and four straight women talking about their lives and asked them to watch the videos back and record the emotions they felt as they discussed different subjects.

Next, 100 women - 67 straight and 43 lesbians - were asked to watch these same videos and judge what emotions the videoed women were feeling. They were also asked to guess their sexuality based on responses.

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