Because scientists are just the academically qualified version of trolls, the researchers had an ace up their sleeve -- along with the regular human porn that the participants had expected, they included footage of bonobo apes fully going at it. In addition, because the natural sound on the videos didn't fully convey the extent of the apes' enthusiasm, the videos were overlaid with sound effects of apes getting each other off like porn stars in a cheap Brazzers clip.
As you could imagine, when asked about how aroused they were by explicit ape sex, everyone responded hell to the fuck no. But the photoplethysmogram said otherwise -- men of either orientation were pretty much unimpressed by the bonobos, but the women were betrayed by science, displaying "strong and swift" genital arousal in response to seeing apes make the beast with two backs.
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If your wife insists on watching Planet of the Apes over and over again, now you know why.
So science has finally answered the age-old question of whether women are more turned on by primate intercourse than men are, and the answer is a resounding yes. We can probably expect further investigation with lemurs, alligators, and armadillos until either the funding runs out or they get through all the animals, whichever comes first.