Age of attraction to the opposite sex. Gizmodo io9.

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Even if younger women and older men are more attractive to the opposite sex, it's only one of many factors.

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Gizmodo io9.

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Pheromones are known to be involved in sexual attraction in animals, and research suggests that they may also play a role for people.

Hikers just out enjoying a nice day, then bam.

Even as scientific research has shed more light on sex story foreskin factors that contribute to our selection of a sexual mate, the biology of attraction is complex and not yet fully understood -- and it doesn't help that attraction is particularly difficult to replicate in a lab.

The "Threshold of Creepiness" which marks the less-than-scientific half-your-age-plus-seven rule seems to also mark roughly where men found women most attractive.

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