Why do cats like to smell sweat underarms? This is the reason! Cats like to smell sweat underarms, probably because they like to connect with their owners, and the sweat underarms is an exclusive odor that mixes the smell of their owners. They feel relaxed and feel safe.
Cats are around their favorite owners and they will be intimate with their owners for any time. They often smell the body odor under their armpits, but cats do not think that body odor is smelly. Maybe they think it is the smell of their owners, and they will like the smell of body odor and will be unable to extricate themselves.
There are similar phenomena between people. Some people think it smells like milk, while others think it is body odor.