His real parents, or his human adopted parents? Because I'm not so sure he ever had a chance to see his real parents fuck. Not unless they taped it and left it on one of those crystals in his fortress of solitude. π€·π»ββοΈ
The point was he has "X-Ray" vision, which lets him see through solid objects. Ergo, he likely couldn't help seeing them from time to time until he learned to control that power.
I believe the point is, usually your kids don't have the power to see through walls. Of course I'm pretty sure most interpretations of superman, Depending on the interpretation of superman, he discovers his powers between 12 and 18.
If he has x-ray vision shouldn't he just be seeing a bunch of bones or other dense objects not penetrable by x-rays? Can it be shut off? How? Are we sure he wasn't responsible for a drastic rise in cancer rates by going around just blasting everyone with his radiation vision all day?