That leaves calling procreation either supererogatory or merely permissible.
From the scienceblogs.com
My servant never ceases drawing near to Me through supererogatory works until I love him.
From the en.wikipedia.org
Such efforts are termed supererogatory, beyond the call of duty.
From the nytimes.com
Prokosch uses all the four-letter words that his earlier elegance would have found quite supererogatory.
From the time.com
Some supererogatory acts are heroic-they involve people running into burning buildings to save others.
From the scienceblogs.com
I don't think we want to say it's supererogatory.
From the scienceblogs.com
Practically, the necktie is as supererogatory as those little belts and buckles that used to adorn the backs of men's trousers.
From the time.com
The supererogatory excellence of Workforce's comeback at Sandown on Thursday confirmed the present crop of older horses as stronger than in many seasons.
From the independent.co.uk
More examples
Excess: more than is needed, desired, or required; "trying to lose excess weight"; "found some extra change lying on the dresser"; "yet another book on heraldry might be thought redundant"; "skills made redundant by technological advance"; "sleeping in the spare room"; "supernumerary ...
Supererogation (Late Lat. supererogatio, payment beyond what is due or asked, from super, beyond, erogare, to pay out, expend, ex, out, rogare, to ask) is the performance of more than is asked for, the action of doing more than duty requires. ...
Pertaining to supererogation, or doing more than is required, especially with reference to good works in Roman Catholicism
To act above or beyond the call of duty. A supererogatory act is morally good and goes beyond what is required by duty.
Above and beyond the call of duty. Although agents are not obliged by the dictates of ordinary morality to perform supererogatory acts extraordinary feats of heroism or extreme deeds of self-sacrifice, for example they may be commended for doing so. ...
Superfluous; nonessential; doing something above and beyond what is required by law, duty, custom or normal circumstances.