Marriage 2.9.21

[Noah and his sons] were blessed in the same way as Adam and Eve, when God said: “Increase and multiply, fill the earth, and rule over it” (Genesis 9:1; Genesis 1:28).

Therefore this pleasure, which you wish to make appear diabolical, was already present in the couples mentioned above. Good in its institution, it also continued under the blessing. There is no doubt that “Increase and multiply and fill the earth” was said to Noah and his sons about the union of bodies whose practice had already become established.