There is also Genesis 19:30–38 about Lot and his two daughters. It seems that circumstances alter cases.
Let’s get our father drunk and lie with him, because he is the only man of our people left on the earth?
The Bible does not express approval, and the circumstances scarcely apply to Musk senior.
If you say the ick factor doesn’t matter, a lot of morality is out the window.
There’s nothing in Lot’s story that says it was ok, though. Just that it happened.