Yinglets are instinctively driven to stay in groups, which results in the formation of many “mini-families,” regardless of whether or not there is any romantic interest involved. Even if a group only consists of 2 yinglets, their survival rate is many, many times higher than one moving alone.

This is one of the reasons that people tend to leave yinglets alone if they’re not being annoying; one of them is near-powerless, but two of them (if armed) are a considerable threat, and three or more is almost impossible to fight without sustaining some deep puncture wounds (from spears that are frequently coated in rather nasty stuff).