This would apply to r/K.
For example, rabbits have a shorter average lifespan than wolves. It checks out.
Sex has the highest metabolic cost, and it’s no small wonder promiscuous people tend toward exhaustion, adrenal fatigue and substance abuse problems.
I would chart this back to the dopamine system.
Too much would exhaust the system and sap its longevity, like going on a crash diet would drain willpower.
And what is degeneracy, really, if not a gradual deterioration of lifeforce?