T 3.2.12.9

As to the obligations which the male sex lie under, with regard to chastity, we may observe, that according to the general notions of the world, they bear nearly the same proportion to the obligations of women, as the obligations of the law of nations do to those of the law of nature. 'Tis contrary to the interest of civil society, that men shou'd have an entire liberty of indulging their appetites in venereal enjoyment: But as this interest is weaker than in the case of the female sex, the moral obligation, arising from it, must be proportionably weaker. And to prove this we need only appeal to the practice and sentiments of all nations and ages.