Attraction, love, sex : the inside story / Simon LeVay.
"To find out why people have sex, Curt Lively trawls a New Zealand lake for mud snails. Mayte Parada puts volunteers in an MRI scanner and turns on the porn. Andrea Ganna searches the genomes of half a million Brits. Almond-scented rats, Genghis Khan's family tree, Pornhub statistics-it�...
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