Direct quotation
Against Julian 3.9.18
The good God, through whom everything was made, himself formed the parts of our body.
He who made bodies also distinguished the sexes. He made them different in form in order to join them in action; the difference between their organs supplied the reason for their union.
Therefore the union of bodies comes from the same source as bodies themselves.
Once you have conceded this, however unwillingly, it follows that so many good things—bodies, sexes, unions—cannot have evil fruits.
Latin
Deus - inquis - bonus, per quem facta sunt omnia, ipse corporis nostri membra formavit
Qui autem corpora fecerat, divisit et sexum: divisit in specie, quod in operatione coniungeret; fecitque causam coniunctionum dissimilitudo membrorum
Ab ipso igitur commixtio corporum, a quo est origo corporum
Quod cum ingratis, - inquis - concesseris, sequitur tot rerum bonarum, corporum, sexuum, coniunctionum, malos fructus esse non posse