Calvin Klein's advertisements are so great because the sex appeal and lust between the models seems so natural. Turns out they don't need to pay human models to fake it for their men's Obsession scent, when there are big, hot, hulking cats out there who naturally lust for the stuff. Zookeepers at the Bronx Zoo discovered the cats like to rub, hug, and lick things sprayed with Calvin Klein's men's Obsession scent. Now researchers are using the fragrance for crucial research in Guatemala, in which they put Obsession-spritzed rags in the forest to attract jaguars to their hidden cameras. How else are scientists supposed to see them having sex?