Bonar interpreting Malthus says (p. 53) that impure celibacy falls under
the head of "vice," and not of "moral restraint."

To Malthus, vice and misery, as checks to population, were an evil
greatly to be deplored in civilized man, and not only did he declare
that moral restraint obtained as a check, but he also declared it a
virtue to be advocated and encouraged in the interest of society, as
well as of the individual.

His moral restraint was delayed marriage with continence. He trusted to
the moral force of the sexual passion in a continent man to stimulate to
work, to thrift, to marriage; to work and save so that he may enter the
marriage state with a reasonable prospect of being able to support a
wife and family.

Malthus never anticipated the changes and developments of recent years.
He advised moral restraint as a preventive measure in the hope that vice
and misery, as checks would be superseded, and that no more would be
born into the world than there was ample food to supply. He believed
that moral restraint was the check of civilized man, and as civilization
proceeded, this check would replace the others, and prevent absolutely
the population pressing upon the limits of subsistence.

He saw in moral restraint only self-denial, constant continence, and
entertained not a doubt, that the generative instinct would be cheated
of its natural fruit. The passion for marriage is so strong (thought
Malthus) that there is no fear for the race; it cannot be
over-controlled.

The gratification of the sexual instinct, and procreation were the same