As scripture testifies, His seed remained within Him ... when Moses received the tablets, he brought humankind a written description of what God IS NOT ... God is not a liar, therefore He cannot lie. We humans on the other hand ...
As I read your post, I have the impression you mean that to say that Jesus' genetic seed, as in sperm, did not leave him; i.e., he did not have intercourse with a woman--ok, or anything else, neither ever have a wet dream. I hope not to have put that inference upon your writing inappropriately, but I believe that would not reasonably follow the context from which that piece of Scripture comes, I John 3:9, where, "No one who is born of God practices sin, because His seed abides in him; and he cannot sin, because he is born of God." speaks to God's seed being in anyone born of God, as Jesus was (though through Mary, He had David's seed, also) and therefore even a human, so begotten, cannot sin."
Yet, I don't see eye-to-eye with (for example, Lutherans) those who would aver that we sin because we have a sinful nature. Conversely, if we were brought to this Earth as "born of God", we would not, or even "could not." I subscribe to the tenet, "fully God, fully human." I don't reflexively ascribe infallibility to various Councils any more than I would to a pope. Such I do ascribe to canonical Scripture.
We must be in the dispensation of which Ezekiel 18:2-3 speaks. Sinning is no longer a question of parentage or seed. "The soul who sins shall die" (without a Savior to wash those sins away).
Mt 5:48 ("Therefore you are to be perfect, as your heavenly Father is perfect.") would be a horrible taunt if God's Holy Writ were to command an impossibility. A gerbil endlessly attempting to catch his tail in a spinning race would serve a similar, mindless point.
HF