All living beings, not just animals, but plants and microorganisms, perceive. To survive, an organic being must perceive - it must seek, or at least recognize, food and avoid environmental danger.
The eating of tundi fruit deprives a man of his sense, while the vacha root administered revives his reasoning immediately. A woman at once robs a man of his vigour while milk at once restores it.
The heart of a woman is not united; it is divided. While she is talking with one man, she looks lustfully at another and thinks fondly of a third in her heart.