Sugaring is a natural form of removing body hair. Sugaring started centuries ago, because even then, body hair was regarded as being ageing and unhygienic.
Sugaring not only removes unwanted hair, it also removes dead skin cells, leaving the skin smooth and silky, which makes moisturising more effective. If this layer of flaking, dead skin is not removed, applying moisturisers brings little or no benefit to the good layers underneath.