https://www.researchgate.net/publication/245634594_Chains_of_Affection_The_Structure_of_Adolescent_Romantic_and_Sexual_Networks1
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https://www.researchgate.net/publication/245634594_Chains_of_Affection_The_Structure_of_Adolescent_Romantic_and_Sexual_Networks1
There's a gay hookup on the branches just to the left, too.