Rather, his own flesh. Ἑις into: the flesh being conceived as the soil into which the seed is cast. Comp. Mat 13:22. His own, because the idea of personal, selfish desire is involved.
Corruption (φθοράν)
Primarily, destruction, ruin; but it also has the sense of deterioration, decay, as 1Co 15:42. Comp. Aristotle, Rhet. iii. 3, 4: “And thou didst sow (ἔσπειρας) shamefully (αἰσχρῶς) and didst reap (ἐθερίσας) miserably (κακῶς).” See also Plato, Phaedrus, 260 D, and on defile, Rom 3:17.