Careful! Aposiopetic is going to jump down your throat. ;-)
is strongly associated with genetic inheritance factors from one or both parents. Replicative studies have confirmed this over and over.
You're right, of course; I misspoke. (I actually caught it as I clicked the post button; what is it about the irrevocable act of clicking that makes me so observant?) The point is that the genetic disfunctions--that word again!--that lead to infertility are transitory in the gene pool, and cannot be considered an integral part of the function of the human organism.
They are like wounds in the body; wounds are inflicted, they heal, and more are inflicted again, but they can in no sense be counted among the functions of the body.
Bottom line: it is the epistemological function of genes and organisms to replicate. Infertility, insofar as it interferes with that, is a disfunction.