It's called an analogy. You criticized contraception for being unnatural...as if being unnatural was inherently negative.
By “space ship” I assume you mean a vehicle of some sort which flies above the atmosphere.
What’s unnatural about that?
Contraception is an attempt to violate the laws of nature, in which sex and conception are intextricably intertwined.
Against Natural Law. Like trying to eat without gaining weight so vomiting afterwards. That is unnatural.
Building a spacecraft is not unnatural. It may be a waste of money, depending on one’s POV.
I realize that hedonits and/or atheists (often the same) put personal gratification above all else and consider any argument which includes God to be useless, so I don’t know if this discussion is going to be worth while or not.