The animal way does not concern with the feelings of the partner. It is simply a matter of satiating their lust. To a man (or a woman) in the animal sentiment, they can sleep just about with anyone. They don’t have to be in love, they don’t need to feel love. Just like a dog will happily take a piece of bread from anyone, a sexual animal is only looking for a piece of flesh. They will extinguish themselves as ably in a brothel as much as with their partner.