New limited series: The Rocket landed in Alabama.

In 1969, science fiction writer Larry Niven wrote an article about how Superman could never have sex with a human woman, because he would destroy her.

So maybe Supergirl is the only option he has.

Alex from streetfighter would advocate for this. He did marry his sister after all.

I mean, we don't know kryptonian genetics. Might be both safe and normal there

Aren't there several stories where he does fall for her?