User blog comment:Jacob southmage/Information revealed form Mahj memories (spoilers)/@comment-4536066-20140321032216/@comment-4536066-20140321183141

"Factors into Enakhra's refusal to procreate"

I don't think so. They don't only kill each other so they can rejuvinate, so it's probably a safe guess that they don't only breed to enervate.

"Did the other tribes do this?"

Obviously we don't know